mibiomi patches Ambassador Envelope Co.
6705 Keaton Corporate Pkwy
O'Fallon, MO 63368
Ph: (636) 477-1300
Fax: (636) 477-7648
Toll Free: (800) 325-4510

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Flap Styles

The seal flap is the portion of the envelope that is folded over and sealed to the rest of the envelope. Numerous styles are available to accommodate the functionality and appearance required.

envelope with commercial (round) flap

Commercial (Round)

Designed with semi-rounded ends, commercial flaps are designed to be processed quickly through mail metering machines. They also seal easily when bulky contents are being mailed and work well in most inserting and laser printing equipment.

envelope with square flap


Often used on Announcement style envelopes, square flaps have a contemporary look with a large imprint area. The lack of a shoulder area, however, can cause problems with automatic inserting equipment.

envelope with bankers (wallet) flap

Bankers (Wallet)

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This flap is somewhat squared, but with rounded corners. It is most commonly used on booklet style envelopes and heavy mailing applications because it seals bulky contents well and can be used in most automatic inserting, mail metering, and printing equipment.

envelope with pointed flap


The most common form of flap for baronial style greeting card envelopes and stationary, this style does not tend to work well with inserting or metering equipment.

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Ambassador Envelope Co.