1) Business & Correspondence Envelopes:
Widely used for business and personal correspondence. Commercial and Side Seam flap styles are ideal for machine insertion.
Wallet flaps provide a large area ideal for imprinting. Square flaps are contemporary, but not recommended for machine insertion.

 

Envelope Type Size Enclosure
6 1/4 3.5" x 6" 3.25" x 5.75" 
6 3/4 3.625" x 6.5" 3.5" x 6.25"
8 5/8 3.625" x 8.625" 3.5" x 8.375"
7 3.75" x 6.75" 3.5" x 6.5"
Monarch (7 3/4) 3.875" x 7.5" 3.75" x 7.25"
9 3.875" x 8.875" 3.75" x 8.675"
9 (policy) 4" x 9" 3.75" x 8.5"
10 4.125" x 9.5" 4" x 9.25"
DL 4.313" x 8.625" 4.125" x 8.375"
11 4.5" x 10.375" 4.25" x 10.125"
12 4.75" x 11" 4.5" x 10.75"
14 5" x 11.5" 4.75" x 11.25"
16 6" x 12" 5.75" x 11.75"

 

2) Booklet Envelopes:
This style is ideal for annual reports, brochures, sales materials, and more. The open side makes it acceptable for automatic insertion.

Envelope Type Size Enclosure
3 4.75" x 6.5" 4.5" x 6"
4 1/2 5.5" x 7.5" 5.25" x 7"
5 5.5" x 8.125" 5.25" x 7.625"
6 5.75" x 8.875" 5.5" x 8.375"
6 1/2 6" x 9" 5.75" x 9"
6 5/8 6" x 9.5" 5.75" x 9"
6 3/4 6.5" x 9.5" 6.25" x 9"
7 1/4 7" x 10" 6.75" x 9.5"
7 1/2 7.5" x 10.5" 7.25" x 10"
9 8.75" x 11.5" 8.5" x 11"
9 1/2 9" x 12" 8.75" x 11.5"
10 9.5" x 12.625" 9.25" x 12.125"
13 10" x 13" 9.75" x 12.5"

 

3) Catalog Envelopes:
Center seam makes this style more durable for mailing heavy-weight materials.
These envelopes can not be processed through inserting equipment or run through a laser printer.

Envelope Type Size Enclosure
1 6" x 9" 5.75" x 8.75"
1 3/4 6.5" x 9.5" 6.25" x 9.25"
3 7" x 10" 6.75" x 9.5"
6 7.5" x 10.5" 7.25" x 10"
8 8.25" x 11.25" 8" x 10.75"
9 3/4 8.75" x 11.25" 8.5" x 10.75"
10 1/2 9" x 12" 8.75" x 11.5"
12 1/2 9.5" x 12.5" 9.25" x 12"
13 1/2 10" x 13" 9.75" x 12.5"
14 1/2 11.5" x 14.5" 11.25" x 14"
15 10" x 15" 9.75" x 14.5"
15 1/2 12" x 15.5" 11.75" x 15"

 

4) Square Envelopes:
This unusual shape attracts attention to contents. Square envelopes are nonstandard and require additional postage to mail.

Envelope Type Size Enclosure
5" 5" x 5" 4.75" x 4.75"
5 ½" 5.5" x 5.5" 5.25" x 5.25"
6" 6" x 6" 5.75" x 5.75"
6 ½" 6.5" x 6.5" 6.25" x 6.25"
7" 7" x 7" 6.75" x 6.75"
7 ½" 7.5" x 7.5" 7.25" x 7.25"
8" 8" x 8" 7.75" x 7.75"
8 ½" 8.5" x 8.5" 8.25" x 8.25"
9" 9" x 9" 8.75" x 8.75"
9 ½" 9.5" x 9.5" 9.25" x 9.25"
10" 10" x 10" 9.75" x 9.75"
13 ½" 13.5" x 13.5" 13.25" x 13.25"

 

5) Baronial Envelopes:
Deep pointed flap traditionally used for formal announcements and invitations. Not recommended for machine insertion.

Envelope Type Size Enclosure
Professional* (too small to mail) 2.125" x 3.625" 2" x 3.5"
#16 (Mrs.)* (too small to mail) 2.375" x 3.375" 2.25" x 3.125"
#17 (Mr. & Mrs.)* (too small to mail) 2.6875" x 3.6875" 2.5625" x 3.5625"
Gladstone* (too small to mail) 3.563" x 5.562" 3.375" x 5.375"
4-Bar 3.625" x 5.125" 3.475" x 4.875"
5½-Bar 4.375" x 5.75" 4.25" x 5.5"
6-Bar/Walton Outside  4.75" x 6.5" 4.625" x 6.25"
Lee 5.25" x 7.25" 5.125" x 7"
Linwood/Monona Inside 5.25"" x 7.5" 5" x 7.25"
Monona Outside 5.5" x 7.75" 5.25" x 7.5"

 

6) Announcement A-Style Envelopes:
This contemporary design is idea for photographs, greeting cards, small booklets, and promotional pieces.
Do not confuse the A-4 size with metric A4 paper, which fits into a DL size Commercial envelope.

Envelope Type Size Enclosure
A2 4.375" x 5.75" 4.25" x 5.5"
A4 4.25" x 6.25" 4 "x 6"
A6 4.75" x 6.5" 4.625" x 6.25"
A7 5.25" x 7.25" 5" x 7"
A8 5.5" x 8.125" 5.25" x 7.75"
A9 5.75" x 8.75" 5.5" x 8.5"
A10 6" x 9.5" 5.75" x 9.25"