Types of Envelopes


March 16, 2024

In today’s world of digital communication, featuring email and instant messaging, physical paper envelopes are no longer the primary means of interaction and may even strike you as a relic from the past. However, they remain indispensable for various mailing needs.

Envelopes come in an astonishing array of types and sizes, from standard business envelopes to elegant invitation envelopes, each meticulously designed to fulfill various forms of correspondence.

That said, choosing the right envelope is more than a matter of preference. Instead, it’s about ensuring your precious documents and heartfelt messages are delivered securely and in style.

Whether you’re sending a greeting card, an official business contract, or an event invitation, understanding which envelope is appropriate for a given situation is essential.

This article explores the myriad types, sizes, and applications of envelopes, navigating how these pieces of paper play a crucial role in the art of communication.

Are you curious about what envelope types you can send through the United States Postal Service (USPS)? Talk to a retail associate at your local post office. Visit FindPostOffice.org to find your area’s Postal Service facilities.

A Guide to Envelopes

When you hear the word “envelope,” what image comes to mind? For most people, this word immediately brings a picture of a rectangular piece of paper with a triangular-shaped opening flap and is used to house letters.

However, the first known envelopes, which date back to 3,500 to 3,200 B.C., were far from this modern preconception. Instead, as if in total contrast, they were spherical, made of clay, and were used to cover coins. It wasn’t until 2nd century China that we would first glimpse paper envelopes.

This historical tidbit highlights an essential aspect of envelopes – they come in various shapes and sizes. Let’s break down the different types of envelopes available today, shall we?

Envelopes Have Feelings Too!

The primary purpose of an envelope is to protect the contents within it. But aside from its obvious objective, envelopes serve an often forgotten goal – to convey your feelings.

The envelope is the first thing your recipient sees, making it your initial mode of expression. Choosing the appropriate envelope type lets you communicate the intention of the mailpiece and your personality as the mailer.

For instance, a business envelope featuring a company’s logo and return address indicates it contains business correspondence. In contrast, a colorful envelope with whimsical stickers attached shows the sender’s intentions are light-hearted.

How Many Types of Envelopes Are There?

Asking the question of how many envelope types there are is like asking how many grains of sand are on a beach. While some may say there are only 19 and others 7, it’s difficult to put a precise number on the available types of envelopes.

The envelope world is quite diverse. From common styles that follow standard size guidelines to specialized options that use features like security tints, there’s practically an envelope for every occasion.

Common Envelope Styles: What Are the Primary Types of Envelopes?

As mentioned, envelopes come in all shapes and sizes, each designed for a specific purpose. Therefore, choosing the right envelope type suited to your unique needs ensures your message is conveyed as intended.

Unfortunately, with an almost endless supply of envelope styles, picking one perfect for you can sometimes be overwhelming. To simplify this process, let’s explore some primary envelope styles, their unique features, and the situation they’re best suited for.

Baronial Envelopes

If you want an envelope option that exudes elegance and tradition, choose baronial envelopes. These envelopes find their calling in various applications, including greeting cards, personal letters, and invitations.

Although other envelope types can fulfill a similar purpose, baronial envelopes set themselves apart in their design. These envelopes are characterized by their distinctive pointed flap, which is deeper and more extensive than most others.

Baronial Envelope Size Chart

The beauty of baronial envelopes lies in their versatility. They come in various sizes, colors, materials, and flap depths, accommodating diverse needs and preferences.

If you’re contemplating using a baronial envelope to complement your style and the tone of your message, here’s a size chart:

Baronial Envelope TypeEnvelope Width and Height
4 Bar5 1/8” x 3 5/8”
5 Bar5 5/8” x 4 1/8”
5 ½ Bar5 3/4” x 4 3/8”
6 Bar6 1/2” x 4 3/4”
7 ½ Bar7 1/2” x 5 1/2”

A-Style Envelopes

A-style envelopes are distinct for their eye-catching square flap design. This envelope type is perfect as a social announcement envelope. It’s commonly used for invitations, small booklets, and promotional pieces, offering a stylish and contemporary touch to your correspondence needs.

These envelopes typically use text-weight papers as their primary material. However, other A-style envelopes use vellum-finished paper in white and ivory, cotton fiber, and high-grade sulfite paper.

Announcement Envelope Size Chart

As mentioned, A-style envelopes can give your communications a unique and premium appearance with its square flap design and diverse material options. So, if you’re aiming for a distinct presentation, here are some common envelope sizes:

A-Style Envelope TypeEnvelope Width and Height
A24 3/8” x 5 3/4”
A64 3/4” x 6 1/2”
A75 1/4” x 7 1/4”
A85 1/2” x 8 1/8”
A106” x 9 1/2”
Slimline3 7/8” x 8 7/8”

Square Envelopes

Square envelopes are exactly what their name says – they’re square in shape. These envelopes are best known for their symmetrical design. They are simple yet incredibly stylish, making them ideal for announcements, advertising, and invitations.

However, like other envelope types, square envelopes are diverse. Some feature timeless square flaps, while others have deep triangular contour flaps.

Size and Dimensions

Square envelopes come in assorted sizes, ranging from miniature- to calendar-sized, giving you an option for almost every mailing situation. These sizes include the following:

3 1/4” x 3 1/4”7 1/2” x 7 1/2”
5” x 5”8” x 8”
5 1/2” x 5 1/2”8 1/2” x 8 1/2”
5 3/4” x 5 3/4”9” x 9”
6” x 6”9 1/2” x 9 1/2”
6 1/2” x 6 1/2”10” x 10”
7” x 7”


If you want to add flair to your correspondence, square envelopes provide color options. From neutral shades like bright white, natural, and clear translucent to more elegant ones such as ruby red, blonde metallic, and blush, there are so many hues to choose from.

Commercial Envelopes

If you need an envelope type suitable for business correspondence, you can choose commercial envelopes. What makes these envelopes ideal for professional mail is their size, which is purpose-built to accommodate standard paper sizes, like printer papers and letterheads.

Additionally, commercial envelopes sport a lengthwise seal, with the open end positioned at the top, making them a reliable option for ensuring invoices, professional letters, and other documents reach their destination securely. 

Commercial Envelope Size Chart

Most commercial envelopes are in traditional white, off-white, or gray. While you have limited color choices, the same isn’t true for sizes, allowing you to pick an envelope that lets your professional mail items remain well-organized. Here’s the commercial envelope size chart:

Commercial Envelope TypeEnvelope Width and Height
No. 6 ½ 6 1/4” x 3 9/16”
No. 6 ¾ 6 1/2” x 3 1/2”
No. 7 ¾ (Monarch)7 1/2” x 3 7/8”
No. 98 7/8” x 3 7/8”
No. 109 1/2” x 4 1/8”

Booklet Envelopes

For the perfect solution to enclose brochures, catalogs, and hefty stacks of paper like annual reports and sales materials, consider using the booklet envelope. This envelope type features a long-side flap, ensuring your documents are well-protected during mailing.

Size and Dimensions

Booklet envelopes are versatile, offering a range of sizes to suit various mail items, such as marketing brochures and business proposals. So, whether you need something compact or more spacious, there’s a booklet envelope that fits your specific mailing needs.

Here are some common envelope sizes:

5 1/2” x 7 1/2”7 1/2” x 10 1/2”
5 1/2” x 8 1/8”8 3/4” x 11 1/2”
5 1/2” x 8 1/2”9” x 12”
6” x 9”9 1/2” x 12 5/8”
6” x 9 1/2”10” x 13”
6 1/2” x 9 1/2”10” x 15”
7” x 10”


One of the standout features of a booklet envelope is its wide array of color choices. From colorings that exude sophistication, like midnight black, to tones that give an earthy touch, like avocado, you’ll find an assortment of options to match your branding or personal preferences.

Catalog Envelopes

Despite the various sizes available, some envelopes require you to fold your mail items to make them fit. Enter catalog envelopes, which do away with this practice, giving you ample space for diverse mail items.

These envelopes are ideal when you want to maintain a document’s pristine condition for your recipient, such as those that might be framed or presented professionally.

But what about security? Fortunately, most catalog envelopes have a width-wise sticker closure seal. However, some use clasps, ties, and bubble wrapping for additional protection, perfect for documents for filing and archiving purposes.

Catalog Envelope Size Chart

Like other envelopes, catalog envelopes also come in several sizes. However, because of their intended purpose, they have fewer size options than others. These choices include:

6” x 9”10” x 13”
9” x 12”

Banker Envelopes

If you’re talking about the most common envelope styles, banker envelopes must make the top of the list. They feature distinctive triangular flaps, various color options, and various sizes. They also boast diverse applications, from greeting cards and personal correspondence to interoffice communication.

Air Mail Envelopes

When you need to send essential mail overseas swiftly, the solution typically arrives through the skies. Hence, you use air mail envelopes, which are explicitly designed to ensure your mail reaches its destination promptly. 

Unfortunately, unlike other envelope types, air mail envelopes use a distinct pattern to maintain uniformity for overseas mail delivery.

Disc Envelopes

As the name implies, a disc envelope offers a practical solution if you want to package CDs (compact discs) or DVDs (digital versatile discs) securely. Like air mail envelopes, disc envelopes follow a standard size, which is 5” and 4 7/8” in width and height.

These envelopes often use a combination of plastic and paper as their primary materials. They also sport a cut hole covered with transparent plastic on the front or open side of the envelope, allowing you a clear view of the enclosed disc.

Diamond Flap

The C5 diamond flap envelopes, which measure 9 1/50” x 6 19/50”, are among the most common choices for mailing unfolded A5- or 5 4/5 x 8 3/10 inch-sized documents. 

However, diamond flap envelopes also have other sizes, with the C6 and DL being the most frequently used for high-volume production. A C6-sized envelope has dimensions of 6 19/50” x 4 49/100”. On the other hand, a DL envelope measures 4 3/10” x 8 7/10”.

Diamond High Cut

A diamond high-cut envelope is a diamond flap envelope with an additional layer of privacy. It maintains the attractive presentation of the diamond-shaped flap while concealing the contents after opening.

It’s an excellent choice for business-to-consumer (B2C) communications that require a touch of discretion.

Wallet Envelopes

The wallet envelopes take their name from their wallet-like design. Thanks to their trapezoidal straight flaps, which help in automated insertion, wallet envelopes are often employed in automatic mailing machines.

Choosing this envelope for your correspondence can help make a strong impression on recipients and maximize direct mail campaigns and other forms of professional communication.

DL Wallet

Like diamond flap envelopes, wallet envelopes have a DL or a 4 3/10” x 8 7/10” variant. These dimensions let you mail A4 or 8 3/10” x 11 7/10” letters when folded into three.

Unfortunately, DL wallet envelopes are typically brown- or white-colored, limiting your customization options. However, it’s also this simplicity that makes DL wallet envelopes easily recognizable as business-related mail.

DL Wallet With Window

The DL wallet with window envelope separates itself from the standard DL wallet envelope with a distinctive window. This transparent section eliminates the need for you to address the envelope directly.

This time-saving feature becomes especially beneficial when dealing with large volumes of mail. However, for this feature to work, you must ensure you fold your documents correctly.

Additionally, while it lacks the color choices other envelope types have, the DL wallet with window envelopes provides custom window shapes and positions.

DL Wallet Pocket

Another twist on the standard business envelope is the DL wallet pocket. It features a side entry flap instead of a traditional top entry flap, making it significantly easier and faster to fill. This unique feature makes this specific envelope type popular for finance-related correspondence.

Block Bottom

If you’re looking for an envelope that’s up to the challenge of holding more substantial items, like nuts and bolts, the block bottom envelope may be the right envelope for you.

It features a robust inset that makes it ideal for bulky contents. The distinct feature of block bottom envelopes is their lower portion, which folds out flat, making it a perfect label space.

Board-Back Pocket

While you may wonder what a board-back pocket envelope is, you’ve likely encountered this envelope type before, especially if you’ve ever received photos through the mail.

The primary features of a board-back pocket envelope include a sturdy board on one side, which prevents it from bending during transit, and a label section on the other side made from paper for addressing purposes.

Commercial Square Flap

The commercial square flap envelope is a unique envelope that doesn’t require sealing. While this envelope may seem unsafe, it’s a go-to choice for gifts, vouchers, and promotional materials due to its elegant appearance.

Commercial square flap envelopes boast a square-cut design, with a large top flap equal in size to the bottom flap. So, if you want to make a lasting impression, this envelope style is worth considering.

Pocket Envelopes

The pocket envelope comes in various sizes, some smaller and resembling banker envelopes, while some more extended pocket envelope variations have opening flaps on the short side.

Nevertheless, a pocket envelope’s orientation provides ample space for accommodating various contents, including receipts, coupons, passports, traveler’s checks, and photos.

Broad Pocket

Unlike traditional envelopes, which feature diamond-shaped flaps, broad pocket envelopes offer simplicity. Like wallet envelopes, broad pocket envelopes have a wallet-style closure on their short side.

Sample Pocket

Once upon a time, sample pocket envelopes were used for holding seeds. Today, however, their utility extends beyond gardening. One of the most significant advantages of sample pocket envelopes is their split fastener closure system, allowing you to reuse and store them.

Gusset Pocket

The gusset pocket envelope is a versatile variation of the block bottom envelope. However, unlike the latter, gusset pocket envelopes can expand on all sides. These sides are also generally reinforced, as the name of the envelope type suggests, for more robust usage.

Long Pocket

As mentioned, pocket envelopes have opening flaps on their short sides. The long pocket envelope features a similar flap system. However, due to its more extended design, it’s explicitly designed to hold lengthy, narrow documents or bulkier mail items folded to fit.

Eagle Pocket

Like the DL wallet with window envelopes, the eagle envelope offers a streamlined and transparent back panel. This feature allows for an unobstructed view of the return address.

Interestingly, eagle pocket envelopes may not be named after the majestic bird of prey. Instead, their moniker’s origin may have come from the 1986 film Legal Eagles – fitting, as these envelopes are often associated with the legal profession and are commonly used by lawyers. 

Topless Thumb Pocket

Most envelopes use a closure flap system to secure their contents. On the other hand, the topless thumb pocket envelope takes minimalism to the next level – it doesn’t have a flap.

Instead, this envelope type features a thumb cut, allowing easier access to documents, record cards, and CDs. This distinct characteristic also makes this envelope reusable and an eco-friendly choice for various applications.

String and Washer

As their name implies, string and washer envelopes offer the tactile feel of unwinding a string from a washer. Note that this envelope type may incur a $0.40 nonmachinable fee.

The nonmachinable surcharge is a tariff that USPS puts on mailpieces that its postal workers must manually cancel. For more information on envelopes ineligible for automated processing, visit your local post office, which you can find with FindPostOffice.org’s search tool.

Tissue-lined Tuck

The tissue-lined tuck envelope is the embodiment of luxury. This envelope boasts an elegant tissue paper lining, adding a touch of sophistication to your message or invitation.

Tuck and Slit

If you prefer an envelope without adhesive, the tuck-and-slit envelope is a practical choice. It features a convenient slit for tucking in the flap, providing secure closure without the need for glue. This reusable design is ideal for items that don’t require frequent access.

Tuck Flap

The tuck flap envelope is characterized by a distinctive feature: the throat of the envelope is cut off. Like the tuck and slit envelope, tuck flap envelopes provide a place to crease the flap in. In this case, the envelope throat.

Note that some tuck flap envelopes use peel-and-stick closures, combining the security of a tuck and slit envelope and envelopes that feature traditional adhesives. This versatility makes these envelopes suitable for various applications, including presenting invitations.

Square Flap Envelopes

With their stylish square flap design on the back, the aptly named square flap envelopes are worth considering if you want to add a touch of sophistication to your correspondence.

These envelopes are an excellent choice for sending greeting cards, photos, and other personal communication, as they come in all the standard sizes and various color options.

Size and Dimensions

As mentioned above, square flap envelope sizes include all the standard invitation dimensions, giving you an option for every situation. 

Here are the available sizes for square flap envelopes:

2 7/8” x 6 1/2”4 3/8” x 5 3/4”
3 5/8” x 5 1/8”4 3/4” x 6 1/2”
3 7/8” x 8 7/8”5 1/4” x 7 1/4”
4 1/8” x 9 1/2”5 1/2” x 8 1/4”
4 1/4” x 6 1/4”6 x 9 1/2”


If you want to add more character to your personal correspondence, you can customize your square flap envelopes with various colors, including holiday red, mandarin, and candy pink.

Contour Flap Envelopes

The contour flap envelope offers a unique and luxurious feel for invitations, announcements, and greeting cards. Its deep triangular flap, which almost connects to the bottom edge of the envelope, complements the flap’s smoothly curved tip.

Size and Dimensions

Like square flap envelopes, contour flap envelopes are available in all standard invitation sizes, ensuring a perfect fit for your mail items. 

Here are the standard sizes for this envelope style:

3 5/8” x 5 1/8”5 7/16” x 7 7/8”
4 1/4” x 6 1/4”5 3/4” x 8 3/4”
4 3/8” x 5 3/4”6” x 9”
4 3/4” x 6 1/2”6 1/2” x 6 1/2”
5 1/4” x 7 1/4”


Contour flap envelopes not only feature an extensive array of size options, but they also come in various colors. These shades range from palette tones like baby blue and lilac to more eye-catching hues such as rose quartz metallic and Jupiter metallic.

Regular Envelopes

If you prefer a more traditional approach to business correspondence, consider regular envelopes. These envelopes feature an iconic, timeless design – a conventional flap with no window.

That said, some regular envelopes come with security tints and pre-moistened adhesive flaps for an additional layer of security. These extra features make regular envelopes suitable for checks, invoices, and communication requiring discretion.

Size and Dimensions

Despite their simplistic nature, regular envelopes provide a variety of sizes. The available dimensions include the following:

2 1/8” x 3 5/8”3 7/8” x 7 1/2”
3” x 6 1/4”3 7/8” x 8 7/8”
3 1/2” x 6”4 1/8” x 9 1/2”
3 5/8” x 6 1/2”4 1/2” x 10 3/8”
3 5/8” x 8 5/8”4 3/4” x 11”
3 3/4” x 6 3/4”5” x 11 1/2”


Regular envelopes don’t have to be boring. Fortunately, you have a diverse catalog of color options at your disposal. These include traditional choices, such as white, pastel gray, and classic linen, and contemporary selections, like electric coral, seafoam, and pool.

Window Envelopes

A window envelope is an option with at least one opening in the front. This opening allows your recipient to see the contents within. Like envelopes themselves, window envelopes have several types.

For instance, double-window envelopes feature a viewing screen for the mailing and return addresses

On the other hand, a full-face envelope provides a complete view of the inside, with its entire front side serving as the opening.

Size and Dimensions

Unfortunately, because window envelopes are designed to show specific parts (sometimes all) of the mail within, they follow a strict size guideline. As of October 2023, these envelopes only come in dimensions of 5 34” x 8”.


While window envelopes lack size variation, it doesn’t in terms of color variety. They’re available in diverse tints, including ivory, white linen, brown Kraft, and wasabi.

Open-End Envelopes

Also known as catalog envelopes, open-end envelopes have flaps on their short side. This design language lets you easily place and remove mail items from these envelopes.

Size and Dimensions

Open-end envelopes are available in various sizes, from small ones to accommodate coins and jewelry to oversized envelopes to fit catalogs and booklets.

Here are the dimensions for the available open-end envelopes:

2 1/4” x 3 1/2”6” x 9”
2 1/2” x 4 1/4”6 x 11 1/2”
3” x 4 1/2”6 1/2” x 9 1/2”
3 x 4 7/8”7” x 10”
3 1/8” x 5 1/2”7 1/2” x 10 1/2”
3 3/8” x 68 1/2” x 10 1/2”
3 1/2” x 6 1/2”8 3/4” x 11 1/4”
3 5/8” x 6”9” x 1/2”
4 5/16” x 9 9/16”9 1/2” x 12 1/2”
4 1/2” x 10 3/8”10” x 1/3”
4 5/8” x 6 3/4”11” x 17”
5” x 4 7/8”11 1/2” x 14 1/2”
5 x 7 1/2”12” x 15 1/2”
5 x 11 1/2”12 1/2” x 18 1/2”
5 1/2” x 7 1/2”14” x 18”


If the open-end envelope’s size options haven’t clued you in yet, it has an extensive amount of color choices, with 9” x 12” envelopes alone having a staggering selection of 50, which includes navy, smoke, and sunflower.

Clasp Envelopes

Like open-end envelopes, clasp envelopes are ideal for bulkier mail items, such as office, school, and home supplies. What sets clasp envelopes apart from their open-end counterpart is the presence of a double-prong metal clasp, reinforced eyelet, and sticky flap for additional security.

Size and Dimensions

Because these envelopes are meant to fit more substantial mail items, clasp envelopes are generally available in larger sizes than others. 

Here are the common sizes for clasp envelopes:

6” x 9”9” x 12”
6 1/2” x 9 1/2”10” x 13”
7” x 10”10” x 15”
7 1/2” x 10 1/2”


While the smaller clasp envelopes offer a diverse set of colorings, such as gray wove and bright lemon, the large-sized ones only come in brown Kraft or traditional bright white.

Document Envelopes

If you’re looking to mail flat but beefy mail items, such as magazines, catalogs, or large stacks of paper, you can use a document envelope. This specific envelope type features a three-inch-wide flap on its long side that lets you quickly access the contents while ensuring their safe arrival.

Size and Dimensions

Like clasp envelopes, document envelopes have limited sizes due to their purpose of securing bulkier mail items. The available document envelope sizes and dimensions are as follows:

9” x 12”10” x 15”
10” x 13”12 x 18”


The document envelope follows the design philosophy of “function over form.” Therefore, it stands to reason that it only has gray and brown Kraft as its available color options.

Remittance Envelopes

Donation or remittance envelopes offer a way to collect essential information, serving as the container and the form itself. The outer envelope and the inside of the flap provide ample space to print forms.

The distinct feature of remittance envelopes is that they keep the forms away from prying eyes after you seal them, making them ideal for payment and donation collection. Hence, churches, schools, and fundraising groups prefer to use them.

Size and Dimensions

Remittance envelopes are available in various sizes and dimensions to suit diverse needs. These proportions include the following:

3 1/2” x 6”4 1/4” x 6 1/2”
3 5/8” x 6 1/2”4 5/8” x 8 7/8”
3 7/8” x 8 7/8”


Most remittance envelopes are available in pastel colors. These shades include cream, pastel green, pastel pink, pastel canary, pastel blue, and goldenrod. However, if you prefer your envelopes to have a more professional appearance, remittance envelopes also come in bright white.

Pointed Flap Envelopes

Like baronial envelopes, pointed flap envelopes sport refined edges and distinctive pointed triangular closure flaps. This envelope type invokes a classic look, making it suitable for formal correspondence, such as invitations.

Size and Dimensions

Invitations come in various shapes and sizes. So, pointed flap envelopes do, too. Here are the available sizes and dimensions for this specific envelope style:

3 5/8” x 5 1/8”5 1/4” x 7 1/2”
4 1/8” 5 1/2”5 1/2” x 7 1/2”
4 3/8” x 5 3/4”5 1/2” x 7 3/4”
4 3/4” x 6 1/2”6” x 8 1/4”
5 1/4” x 7 1/4”6 1/4” x 8 1/2”


Being an envelope designed to give off elegance, pointed flap envelopes have a substantial selection of color offerings. If you want your correspondence to exude passion, there’s ruby red. On the other hand, if you prefer a more bespoke look, you can choose midnight black.

Mini Envelopes

Despite their small stature, the mini envelope isn’t lacking in the style department, offering bright and metallic color options. This specific envelope type’s primary purpose is to provide a convenient way to hold smaller mail items, such as seating cards, greeting cards, gift cards, and business cards.

Size and Dimensions

While relatively smaller than other envelope styles, mini envelopes still come in various sizes and dimensions, including the following:

2 1/2” x 4 1/4”3” x 4 1/2”
2 11/16” x 3 11/16”


As mentioned, you have several color options for mini envelopes, ranging from natural colors, like white and black linen, to more radiant selections, including garnet, magenta, and crystal metallic.

Lined Envelopes

A lined envelope features an elegant lining extending from 1/4” of the bottom inside of the envelope to its flap. You can also add customized printing on the envelope’s front side or the flap to add your unique touch.

Due to their luxurious design, lined envelopes are ideal for a bit of surprise for your recipients and a perfect holder for wedding invitations, photo greeting cards, or heartfelt letters.

Size and Dimensions

Lined envelopes come in most standard invitation sizes, which include dimensions of 4 3/8” x 8 1/4” and 5 3/4” x 8 3/4”.


One of the most distinct features of lined envelopes is their color diversity, allowing you to choose colors for the envelope and the lining. These choices include white with gold lining, silver with black lining, and natural with red lining.

Specialty-Use Envelopes

As their name suggests, specialty-use envelopes fulfill specific purposes or applications beyond mailing letters and documents. Uses can vary, from protecting CDs and DVDs from scratches to holding credit cards and coins.

Size and Dimensions

While specialty-use envelopes can accommodate various mail items, ranging from tickets, X-rays, and stamps, they generally come in a size of 3 7/8” x 8 1/2”.


Like other envelope types, specialty-use envelopes are available in various shades. From clear translucent to limelight, multiple options are available to help you see the contents within or to organize your envelopes.

Folded Cards

If you require an envelope that you can fully personalize or as a creative outlet, consider folded cards. These envelopes allow you to integrate your branding or message on the outside and provide a space for your recipients on the inside for their replies- like a response card.

Size and Dimensions

A noteworthy feature of a folded card is that it lets you mold it to your preferences and needs. Fortunately, you don’t have to worry about insufficient space, as these envelopes come in various sizes.

Here are the common dimensions for folded cards:

2 9/16” x 3 9/16”5” x 7”
3 1/2” x 4 7/8”5 1/8” x 7”
4 1/4” x 5 1/2”5 1/2” x 8 1/2”
4 4/8” x 6 1/4”


An envelope isn’t customizable if you can’t pick your preferred colors. Luckily, folded cards are available in diverse palettes, from metallic colors, such as silver and gold, to natural ones that use textures and materials, like natural embossed and natural recycled.


Like folded cards, notecards are blank canvases, allowing you to add a personal touch to your correspondence. This envelope type utilizes high-quality cardstock or heavy-weight paper, making it durable and luxurious.

Size and Dimensions

Notecards come in various sizes and dimensions, allowing you to make them personable and unique. Here are the available size options for notecards:

2” x 3 1/2”4 5/8” x 6 1/4”
2 9/16” x 3 9/16”4 3/4” x 4 3/4”
3 1/2” x 4 7/8”5 1/8” x 7”
4” x 6”5 1/2” x 8 1/2”
4 1/4” x 5 1/2”5 3/4” x 5 3/4”


You’ll have your fill of color choices with notecards. Do you want your envelope to stand out? Consider using a bright color like sunflower or teal. If you prefer a more subdued appearance, you have your pick of natural linen, vintage plum, and champagne.

Vertical Square Flap Envelopes

Unlike standard square flap envelopes, vertical square flap envelopes have a vertical orientation, technically making them rectangular. Nonetheless, these envelopes make suitable containers for invitations, greeting cards, and photos like their square counterparts.

Size and Dimensions

Unfortunately, vertical square flap envelopes only come in a size of 5 1/4” x 7 1/4”. While severely limited in customization, these dimensions can accommodate various mail items.


As of October 2023, vertical square flap envelopes are only available in six colors, including bright white, natural, smoke, midnight black, grocery bag, and ruby red.


A cardstock can serve various applications, from small greeting cards to restaurant menus. These blank canvases let you unleash your creativity and add personality to your correspondence.

Size and Dimensions

Like notecards and folded cards, cardstocks are available in various sizes, including the following:

4 3/16” x 5 7/16”11” x 17”
8 1/2” x 14”12” x 12”


Cardstocks boasts a staggering collection of over 100 color choices and textures. These tints include classics, such as white, natural, and cream parchment, and striking colors, like copper metallic, chocolate, and boardwalk blue.


While you can put almost anything inside an envelope if it fits, traditional correspondence involves paper.

Size and Dimensions

Standard paper sizes that will fit most envelopes include the following:

4” x 6”8 1/2” x 14”
4 3/16” x 5 7/16”11” x 17”
5” x 7”12” x 12”


You’d think that paper used with envelopes only comes in one color: white. However, paper colorings can be as diverse as the selections for envelopes. This variety lets you tailor your message or presentation to make a lasting impression.

All-Purpose Window Envelopes

As mentioned, window envelopes provide a viewing section to see the contents. All-purpose window envelopes take this concept to the next level by providing a large window on the front, eliminating the need for multiple windows.

Size and Dimensions

All-purpose window envelopes are ideal for statements. With that in mind, it makes sense that this envelope type has a standard size with dimensions of 4 1/8” x 9 1/2” in width and height.


Unlike envelope types, such as mini envelopes or square flap envelopes, all-purpose window envelopes are more business-oriented, warranting more professional colors, like white wove, white with security tint, grocery bag, navy, and wasabi.

Double-Window Envelopes

Standard window envelopes have one window. On the other hand, double-window envelopes, as their name suggests, have two. These viewing sections display the sender’s and the recipient’s address information, making double-window envelopes ideal for business correspondence.

Size and Dimensions

Like all-purpose window envelopes, double-window envelopes have a standard size for their professional purpose. The dimensions of a double-window envelope are 3 5/8” x 8 3/4”.


As mentioned, your chosen envelope type can convey the purpose and intent of your mail. The same is true for the color you pick. Fortunately, there’s no room for misunderstanding with double-window envelopes as they’re only available in bright white.

Thumb-Cut Envelopes

A thumb-cut envelope has a small cut-out or notch on its side, allowing you to retrieve its contents using your thumb quickly. This envelope type is perfect for credit cards, business cards, or other mail items you must open and close frequently.

Size and Dimensions

The standard thumb-cut envelope size follows the dimensions of 2 3/8” x 3 1/2”. These measurements provide ample space to accommodate items that fit the typical credit card size.


While thumb-cut envelopes only have one size, they offer 44 color options, including metallic, natural, and vibrant selections. These envelopes are also available in various materials, such as linen, cotton, and recycled paper.

Full-Face Window Envelopes

Like all-purpose window envelopes, full-face window envelopes feature a large transparent screen on the front. However, the latter’s window is considerably more extensive, taking up most of the envelope.

 This envelope type is best for mailing catalogs, account statements, or other documents that benefit from an oversized viewing section large enough to show off the entire contents.

Size and Dimensions

Considering that full-face window envelopes can display various mail items, there are several size options available. 

Here are the dimensions for the various size choices:

4 1/8” x 9 1/2”9” x 12”
6” x 9”10” x 13”


Like other envelopes that feature a viewing window, full-face window envelopes have various colors to suit your preferences, including bright white, midnight black, grocery bag, and citrus.

Blank Standard Presentation Folders

If you need a sturdy envelope to mail brochures, reports, and other personal and professional documents, consider using a blank standard presentation folder.

The distinct feature of this envelope type is that it includes four-inch-high interior pockets on either flap, giving you ample space to store and secure your mail items. 

Size and Dimensions

The blank standard presentation folder has several standard sizes to accommodate commonly used documents. 

Here are the dimensions for the available size options:

6” x 9”9” x 14 1/2”
9” x 12”


While blank standard presentation folders can be clean canvasses for you to customize, they are available in 33 hues, covering almost the entire color spectrum.

Playing Cards

Card games, such as poker, crazy eights, and cheat, are a fun way to pass the time. But if you want to customize your gaming nights with your photos, personal messages, and designs, you can with playing card envelopes.

Size and Dimensions

Playing card envelopes, as their name implies, are explicitly designed to store playing cards. Therefore, they also follow the playing card standard size – 2 1/2” x 3 1/2” in width and height.


The available colors for playing card envelopes can vary depending on where you buy them. However, considering that these envelopes are created with customization in mind, expect various color options.

Expansion Envelopes

If your mail items don’t fit standard envelope sSizes, consider expansion envelopes. These envelopes feature an accordion-folded side panel that can expand from one to four inches, making them ideal for books and financial reports.

Size and Dimensions

Like other envelopes specializing in bulkier mail items, expansion envelopes have limited size options. The available sizes have dimensions of 10” x 13” x 2” and 10” x 15” x 2”.


Unfortunately, diversity isn’t the expansion envelope’s strong suit. The only color options for this specific envelope type are Tyvek, white Kraft, and brown Kraft.

Poly Mailers

Poly mailers are lightweight, moisture-resistant envelopes made with polyethylene. If you’re looking for an envelope that can help avoid moisture damage to documents, apparel, or pharmaceuticals, choose poly mailers.

Size and Dimensions

Because of their intricate design and manufacturing process, poly mailers are uniform with dimensions of 10” x 13” in width and height.


Polyethylene has a milky-white coloring. While polyethylene can take on various colors using plastic colorants, poly mailers are only available in white.

Spot Seal

A spot seal envelope is an envelope type featuring an adhesive to secure your mail items within. Because of this sealing solution, spot seal envelopes make perfect containers for booklets, magazines, and other flat but bulky materials.

Size and Dimensions

Like expansion envelopes, document envelopes, and others that cater to more oversized mail items, spot seal envelopes don’t have much size variety. The standard size for this envelope style is 10” x 13”.


Spot seal envelopes are ideal for professional and business needs. Therefore, it uses classic colors like bright white to convey elegance, simplicity, and sophistication.

LUX Mailers

LUX® mailers offer an alternative to traditional mailers. These envelopes use high-quality cardstocks like notecards do and “peel and press” strips, which work like spot seals. LUX mailers also feature a quick-open zipper system, allowing the recipient to access the contents.

Size and Dimensions

Like spot seal envelopes and other specialty-use envelopes, LUX mailers only have one size. The standard measurements are 9 1/2” x 12 1/2” in width and height.


If you want to add character to your correspondence, you can do so with LUX mailers’ diverse color selection. Choose black linen, smoke, and midnight black for a bespoke feel. On the other hand, pick silver metallic, gold metallic, and magenta if you want your mail to stand out.

A single-window envelope is a mailing envelope with a transparent window for the recipient’s address. While using a single-window envelope eliminates the need to print the recipient’s information, you still must write your return address.

Euro Flap

For a blend of contemporary aesthetics and timeless elegance, the euro flap envelope is worth considering for your cards and invitations. This envelope type uses Reich paper, made using 100% brilliant white cotton.


The colorplan envelope stands as a frontrunner in the colored paper market, boasting over 55 color options, making it suitable for almost every situation. What sets this envelope type apart is its vellum finish, which adds a tactile “toothy” texture to your correspondence.


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