Styles & Standards

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US Styles & Standards

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When choosing envelopes, remember that the U.S. Postal Service imposes a surcharge on non-standard size letters that cannot be processed by automated sorting machinery. The #10 envelope is the standard size for U.S. business correspondence.

Below are some common envelope styles along with accepted postal requirements for First-Class Mail.

A series: For announcements, small booklet and business announcements, the A series envelope is popular. Designed for use with matching text and cover papers.
View Sizes

Ref # Envelope size Enclosure size
A-2 4 3⁄8” x 5 3⁄4” 4 3⁄16” x 5 1⁄2”
A-6 4 3⁄4” x 6 1⁄2” 4 5⁄8” x 6 3⁄16”
A-7 5 1⁄4” x 7 1⁄4” 4” x 6 7⁄8”
A-8 5 1⁄2” x 8 1⁄8” 5 1⁄4” x 7 3⁄4”
A-Long 3 7⁄8” x 8 7⁄8” 3 3⁄4” x 8 5⁄8”
A-10 6” x 9 1⁄2” 5 3⁄4” x 8 5⁄8”
Slimline 3 7⁄8” x 8 7⁄8” 3 5⁄8” x 8 5⁄8”
 

Commercial: Side with opening allows for overall printing. A favorite for booklets, catalogs, folders, annual reports and more. View Sizes


Ref # Envelope size Enclosure size
6 1⁄4 3 1⁄2” x 6” 3 1⁄4” x 5 1⁄4”
6 3⁄4 3 5⁄8” x 6 1⁄2” 3 1⁄2” x 6 1⁄4”
7 3 3⁄4” x 6 3⁄4”
7 3⁄4 3 7⁄8” x 7 1⁄2” 3 3⁄4” x 7 1⁄4”
8 5⁄8 3 5⁄8” x 8 5⁄8”
9 3 7⁄8” x 8 7⁄8” 3 3⁄4” x 8 5⁄8”
10 4 1⁄8” x 9 1⁄2” 4” x 9 1⁄4”
11 4 1⁄2” x 10 3⁄8” 4 1⁄4” x 10 1⁄8”
12 4 3⁄4” x 11”
14 5 ” x 11 1⁄2”
     

Booklet: Side with opening allows for overall printing. A favorite for booklets, catalogs, folders, annual reports and more.
View Sizes

Ref # Envelope size Enclosure size
3 4 3⁄4” x 6 1⁄2” 4 1⁄2” x 6”
4 1⁄2 5 1⁄2” x 7 1⁄2” 5 1⁄4” x 7”
5 5 1⁄2” x 8 1⁄8”
6 5 3⁄4” x 8 7⁄8” 5 1⁄2” x 8 3⁄8”
6 1⁄2 6” x 9” 5 3⁄4” x 8 1⁄2”
6 5⁄8 6” x 9 1⁄2” 5 3⁄4” x 9”
6 3⁄4 6 1⁄2” x 9 1⁄2” 6 1⁄4” x 9”
7 1⁄4 7” x 10” 6 3⁄4” x 9 1⁄2”
7 1⁄2 7 1⁄2” x 10 1⁄2” 7 1⁄4” x 10”
9 8 3⁄4” x 11 1⁄2” 8 1⁄2” x 11”
9 1⁄2 9” x 12” 8 3⁄4” x 11 1⁄2”
10 9 1⁄2” x 12 5⁄8” 9 1⁄4” x 12 1⁄8”
13 10” x 13” 9 3⁄4” x 12 1⁄2”
       

Catalog: Large envelopes used for catalogs magazines, folders, reports and more. Gummed flap provides protection for heavy contents. View Sizes


Ref # Envelope size Enclosure size
1 6” x 9” 5 3⁄4” x 8 1⁄2”
1 3⁄4 6 1⁄2” x 9 1⁄2” 6 1⁄4” x 9”
3 7” x 10” 6 3⁄4” x 9 1⁄2”
6 7 1⁄2” x 10 1⁄2” 7 1⁄4” x 10”
8 8 1⁄4” x 11 1⁄4”
8 1⁄2 8 1⁄2” x 10 1⁄2” 8 1⁄4” x 10”
9 3⁄4 8 3⁄4” x 11 1⁄4” 8 1⁄2” x 10 3⁄4”
10 1⁄2 9” x 12” 8 3⁄4” x 11 1⁄2”
12 1⁄2 9 1⁄2” x 12 1⁄2” 9 1⁄4” x 12”
13 1⁄2 10” x 13” 9 3⁄4” x 12 1⁄2”
14 1⁄2 11 1⁄2” x 14 1⁄2” 11 1⁄4” x 14”
15 10” x 15” 9 3⁄4” x 14 1⁄2”
15 1⁄2 12” x 15 1⁄2” 11 3⁄4” x 15”
 

Square: Frequently specified by designers because they make a very uniform, and strong presentation. View Sizes


Ref # Envelope size Enclosure size
5 5” x 5” 4 3⁄4” x 4 3⁄4”
5 1⁄2 5 1⁄2” x 5 1⁄2” 5 1⁄4” x 5 1⁄4”
6 6” x 6” 5 3⁄4” x 5 3⁄4”
6 1⁄2 6 1⁄2” x 6 1⁄2” 6 1⁄4” x 6 1⁄4”
7 7” x 7” 6 3⁄4” x 6 3⁄4”
7 1⁄2 7 1⁄2” x 7 1⁄2” 7 1⁄4” x 7 1⁄4”
8 8” x 8” 7 3⁄4” x 7 3⁄4”
8 1⁄2 8 1⁄2” x 8 1⁄2” 8 1⁄4” x 8 1⁄4”
9 9” x 9” 8 3⁄4” x 8 3⁄4”
9 1⁄2 9 1⁄2” x 9 1⁄2” 9 1⁄4” x 9 1⁄4”
13 1⁄2 13 1⁄2” x 13 1⁄2” 13 1⁄4” x 13 1⁄4”
 

Ticket: Used for movie, concert, and theater tickets. View Sizes



Ref # Envelope size Enclosure size
A-2 4 3⁄8” x 5 3⁄4” 4 3⁄16” x 5 1⁄2”
A-6 4 3⁄4” x 6 1⁄2” 4 5⁄8” x 6 3⁄16”
 

Window: Allows the name and address on encloser to show which eliminates the need to print or label the face of the envelope. Used for invoices, statements, paychecks, receipts, and more. View Sizes

Ref # Envelope size Window size
6 1⁄4 3 1⁄2” x 6” 1 1⁄8” x 4 1⁄2”
6 3⁄4 3 5⁄8” x 6 1⁄2” 1 1⁄8” x 4 1⁄2”
7 3 3⁄4” x 6 3⁄4” 1 1⁄8” x 4 1⁄2”
73⁄4, Monarch 3 7⁄8” x 7 1⁄2” 1 1⁄8” x 4 1⁄2”
8 5⁄8, Check 3 5⁄8” x 8 5⁄8” 1 1⁄8” x 4 1⁄2”,1” x 4”
9 3 7⁄8” x 8 7⁄8” 1 1⁄8” x 4 1⁄2”
10 4 1⁄8” x 9 1⁄2” 1 1⁄8” x 4 1⁄2”
11 4 1⁄2” x 10 3⁄8” 1 1⁄8” x 4 1⁄2”
12 4 2⁄4” x 11” 1 1⁄8” x 4 1⁄2”
14 5” x 11 1⁄2” 1 1⁄8” x 4 1⁄2”
       

Two-way remittance: This is a dual purpose envelope. The large flap can be printed with a message, detached at the perforation, inserted in the envelope and sealed. Allows the name and address on encloser to show. Used for direct mail, coupons, applications, statements, and more. View Sizes

Ref # Envelope size Enclosure size
6 1⁄4 3 1⁄2” x 6”
6 1⁄2 3 1⁄2” x 6 1⁄4”
6 3⁄4 3 5⁄8” x 6 1⁄2” 3 1⁄4” x 6 1⁄4”
9 3 7⁄8” x 8 7⁄8”
10 4 1⁄8” x 9 1⁄2” 4” x 9 1⁄4”
       

Self-sealing: This envelope has two latex surfaces that seal on contact. Flaps are folded down to allow for printing. View Sizes


Ref # Envelope size Enclosure size
6 3⁄4” 3 5⁄8” x 6 1⁄2” 3 1⁄2” x 6 1⁄4”
7 3⁄4” 3 7⁄8” x 7 1⁄2” 3 3⁄4” x 7 1⁄4”
10 4 1⁄8” x 9 1⁄2” 4” x 9 1⁄4”
     

Other: The are many additional envelope styles not described here. Several of the envelope converting houses publish comprehensive booklets, with information on construction, sizes and styles. For more information on any envelope you may be interested in, please call your International Paper or Lindenmeyr Munroe representative.

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