Envelope Sizing

3 7/8 × 8 7/8 inches

#9's are common smaller envelopes mostly used as a reply envelope, and often inserted into the #10 or #11 for speedy returns.

4 1/8 × 9 1/2 inches

The most common size for every day mailing and business needs. Can come plain, or with a variety of windows for return addressing.

4 1/2 × 10 3/8 inches

#11 envelopes primarily used for sending multi-page documents, checks, and as outer mailing envelopes for return-ready envelopes.

4 3/4 × 11 inches

Primarily used for bulky commercial mailings. They offer extra clearance for thick documents, multi-page statements with checks, and marketing brochures.

5 × 11.5 inches

Used for sending thick multi-page correspondence, legal-size documents, multi-page documents and promotional materials that don't fit in smaller envelopes

6 × 12 inches

The largest envelope in the business category, used for mailing oversized documents, policy statements, and promotional materials without needing to fold them.

3 5/8" × 5 1/8 "

Response cards (RSVPs), small greeting cards, thank-you notes, and Save-the-Dates. The smallest standard announcement envelope, most often paired with formal wedding and party invitations.

4 3/8 × 5 3/4 inches

Because of their compact size, they nest perfectly inside larger "A" series envelopes making them ideal as RSVP reply envelopes. Also used for marketing stubs, gift cards, and custom-branded business stationery.

4 3/4 × 6 1/2 inches

Their dimensions make them the industry standard for mailing 4" x 6" physical photos safely. Used to send heartfelt personal messages, holiday greeting cards, or post-event gratitude.

5 1/4 × 7 1/4 inches

They are the industry standard for sending formal invitations (like weddings, baby showers, or galas) and usually hold both the primary invitation and smaller RSVP cards. They comfortably fit standard greeting cards.

5 1/2 × 8 1/8

Used for formal event invitations, large greeting cards, photographs, and announcements. Because of their spacious size, they are a popular choice for enclosing smaller items, such as RSVPs or standard A7 envelopes.

5 3/4 × 8 3/4 inches

Best for large wedding invitations, graduations, elaborate party announcements, and sending bulky or multi-page seasonal cards. Also great for mailing custom-made folded cards, flyers, promotional materials and booklets.

6 × 9 1/2 inches

Used for sending large, oversized invitations, greeting cards, photographs, and event announcements. Because of their generous size, they allow you to mail bulky or unfolded materials without creasing or bending the contents.

2 1/4" × 3 1/2 "

Specifically designed to securely hold small, loose items that would easily get lost in standard envelopes, like coins, jewelry, or small gemstones and workshop pieces.

2 1/2 × 4 1/4 inches

Ideal for saving pocket change or organizing petty cash, or mailing small items inside of a larger envelope. A popular choice for saving and drying garden seeds!

3 × 4 1/2 inches

Used for storing or organizing small items so they do not get lost. Common items include coins, stamps, small buttons, seeds, jewelry, and memory cards.

3 × 5 1/2 inches

Storing, organizing, and protecting small loose items like manufacturing parts, stamps, and collectibles, or for holding monetary gifts inside larger cards. Typically placed inside larger, standard mailing envelopes due to their small size.

3 3/8 × 6"

Used for mailing checks, personal letters, small forms, and receipts. Because of their compact size, they are often used for remittance or donation purposes or as reply envelopes tucked inside larger mailings

3 1/2 × 6 1/2 inches

Used for personal correspondence, smaller documents, and targeted direct-mail marketing campaigns. They are an effective and elegant way of making personal, real estate or financial appeals stand out in a mailbox.

2 3/8 × 3 1/2 inches

Used for storing and protecting credit cards, hotel room keys, or provide an elegant way to present gift cards for holidays, birthdays, or employee rewards while hiding the card number.

Various Sizes

Didn't find what you're looking for? Browse our other mini sizes.

Bubble mailers provide excellent cushioning and protection for fragile items during shipping, keeping your products safe from damage. Their lightweight design helps reduce shipping costs while maintaining the durability your customers expect.

Photo mailers are self-sealing envelopes designed to protect and ship photographs, prints, and other flat media safely without additional packaging. They feature cushioned interiors and secure closures to keep your images pristine during transit.

Cello sleeves provide protective storage for your documents and photos, keeping them safe from dust, moisture, and damage during handling and archival. Available in various sizes to fit standard envelopes and specialty papers, they're an essential supply for anyone who values preservation and organization.

Plastic envelopes offer a durable, water-resistant solution for protecting documents and items during shipping and storage. Available in various sizes and closures, they provide a cost-effective alternative to paper envelopes while maintaining a professional appearance.

Square envelopes offer a modern, distinctive look that stands out in any mailbox and works beautifully for invitations, greeting cards, and special announcements. Available in a range of sizes and finishes, they provide ample space for your message while making a memorable first impression.

Gum closure envelopes feature a moisture-activated adhesive strip along the flap that seals securely when dampened with water or a sponge. This traditional closure method provides a professional appearance and reliable seal, making it ideal for formal correspondence and business mailings.

Bubble mailers provide excellent cushioning and protection for fragile items during shipping, keeping your products safe from damage. Their lightweight design helps reduce shipping costs while maintaining the durability your customers expect.

Commercial flap envelopes are designed for business correspondence and mailings, featuring a secure closure that protects contents during transit and storage. Available in standard sizes like #10 and #6¾, they're ideal for invoices, letters, and professional documents that require a polished presentation.

Policy flap envelopes feature a secure closure design that keeps contents protected during transit and storage. These envelopes are ideal for business correspondence, invoices, and documents that require a professional presentation with added security.

Envelopes with straight flaps deliver a clean, professional appearance that conveys sophistication and attention to detail in every correspondence. Their streamlined design maximizes usable space while maintaining a crisp, contemporary aesthetic that works equally well for formal business communications or elegant personal stationery.

V-flap envelopes offer a distinctive pointed design that adds visual interest and sophistication to your correspondence while maintaining excellent structural integrity. Their unique geometry not only creates an elegant presentation but also provides superior security and a satisfying tactile experience when opening.

Booklet envelopes combine clean, professional lines with practical functionality, making them ideal for presenting catalogs, brochures, and folded documents with polished appeal. Their generous interior space accommodates thick materials while maintaining a compact, organized appearance that enhances brand presentation and protects contents during transit.

Open end envelopes combine clean, minimalist design with practical functionality, offering a sleek aesthetic that complements both professional and creative correspondence. Their straightforward construction makes them ideal for documents, catalogs, and mailings where easy access and quick insertion are essential.