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.
| Type | Size | Enclosure |
|---|---|---|
| 6 1/4 | 3.5″ x 6″ | 3.25″ 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″ |
Booklet
This style is ideal for annual reports, brochures, sales materials, and more. The open side makes it acceptable for automatic insertion.
| 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 | 5.57″ 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″ |
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.
| 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″ |
This unusual shape attracts attention to contents. Square envelopes are nonstandard and require additional postage to mail.
| 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″ |
Deep pointed flap traditionally used for formal announcements and invitations. Not recommended for machine insertion.
| Type | Size | Enclosure |
|---|---|---|
| Professional* | 2.125″ x 3.625″ | 2″ x 3.5″ |
| #16 (Mrs.)* | 2.375″ x 3.375″ | 2.25″ x 3.125″ |
| #17 (Mr. & Mrs.)* | 2.6875″ x 3.6875″ | 2.5625″ x 3.5625″ |
| Gladstone* | 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″</td > | 5″ x 7.25″ |
| Monona Outside | 5.5″ x 7.75″</td > | 5.25″ x 7.5″</td > |
Also called A-style, 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.
| Type | Size | Enclosure |
|---|---|---|
| A-2 | 4.375″ x 5.75″ | 4.25″ x 5.5″ |
| A-6 | 4.75″ x 6.5″ | 4.625″ x 6.25″ |
| A-7 | 5.25″ x 7.25″ | 5″ x 7″ |
| A-8 | 5.5″ x 8.125″ | 5.25″ x 7.75″ |
| A-9 | 5.75″ x 8.875″ | 5.5″ x 8.625″ |
| A-10 | 6″ x 9.5″</td > | 5.75″ x 9.25″ |