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Envelope Glossary

Announcement Envelope:

These envelopes are used widely for sending invitations. They are available in a wide range of sizes, usually designated by a number after the letter A; e.g. A-2, A-6, A-7, etc. Announcement envelopes are often used in combination with the Baronial envelopes described below. The announcement envelope serves as the outer envelope and the Baronial is used for returning a reply to the invitation. See our Invitation Envelopes pages for details.


These envelope can be recognized primarily by their deep pointed flap, as opposed to the square-cut flap of the Announcement Envelopes. They are ideal for that formal look when sending invitations or returning RSVP cards. The name Baronial (sometimes abbreviated Bar.) speaks of high social standing and formality. They are available in a wide range of sizes and paper stocks. Specially cut Panel Cards and Sheets are made to fit inside these envelopes. See our Invitation Envelope pages for details.

Booklet Envelope:

See our Big Envelopes pages for our full line of these mailers. Booklet envelopes are available in sizes ranging from 4-3/4 x 6-1/2" to 10 x 13." The flap is on the long side on booklet envelopes, making them easier to stuff both by hand and by machine than catalog envelopes

Business Reply Envelope:

This is not so much a kind of envelope as a way of printing an envelope to determine who pays the postage. Business Reply envelopes or postcards are recognized by a series of horizontal bars and other special markings. They require a special postal permit. You can think of Business-Reply mail almost as a collect call. The postage is paid by the company to which the envelope is addressed. Another kind of reply mail that is often confused with Business Reply is known as Courtesy Reply or just plain reply mail. These envelopes do not have the horizontal bars or special endorsements and the sender pays the postage.

Catalog Envelopes:

See our Big Envelope pages for our full line of these mailers. Conventional catalog envelopes are available in sizes ranging from 6 x 9" to 12 x 15-1/2" The flap is on the short end (making them more difficult to stuff than the booklet envelopes described above) and they have a seam in the back that runs up the center of the envelope.


What most people think of when you say envelope. This is the line of envelopes used for most correspondence and billing, the workhorse being the #10 regular. See our Business Envelopes pages for a complete selection of commercial envelopes in all sizes.

Diagonal Seam:

Most commercial envelopes have a diagonal seam. The seams run at an angle from the bottom to the throat of the envelope. See our Envelope Anatomy page for more details.


A postal permit printed in the upper right corner of the envelope, usually used for bulk mail. A special permit is required from the Postal Service.

Latex Seal:

Envelopes with a latex seal do not require moisture. The pressure-sensitive adhesive is already applied so when the flap is closed the envelope is sealed. See our Latex Seal page for details.


These envelopes are the same size as a #7-3/4 envelope, but have a larger (sometimes pointed) flap. They are often used for formal personal correspondence. See our Commercial Regular page for more detail

Open End:

The open end envelope has the flap on one of the short sides. Catalog envelopes have an open end.

Open Side:

The open side envelopes has the flap on one of the long sides. Commercial envelopes and booklet envelopes have an open side.

Peel & Seel ®:

These are self-sealing envelopes that have a liner on the flap. Just strip the liner off and close the flap for a tight seal. See our Peel & Seel ® page for a complete selection.


A style of commercial envelope that does not have a window.

Remittance or Wallet Flap:

An envelope having a flap almost as big as the envelope itself. It is often printed on both sides. Remittance envelopes are designed to allow a customer to fill out order or pledge information and enclose a check. They save the expense of having a separate order form or pledge card. Another similar envelope is know as a two-way mailer. See our Remittance page or our Two-Way Mailer page for more details.

Security Tint:

Envelopes with a security tint have an opaque design printed on the inside that makes it almost impossible to read through the envelope. They are most often used to send checks.

Side Seam:

The seams on these envelopes run parallel to the short side. Booklet envelopes are normally side seams. Also some commercial envelopes can be ordered with a side seam.

Special Window:

Our window envelopes page shows the size and position of a standard window on commercial envelopes. If this is not suitable, we can place the window in almost any position on the envelope and also change the size. Minimum order is 2,500.

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