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Bestselling Envelopes

A guide to Envelope sizes

Envelope Sizes

The first form of communication between companies often comes in the form of a letter, and therefore the envelope you use is vital in portraying your company’s image, along with its stationery.

The most common sizes are:


envelope sizes


See the Royal Mail website for latest postal prices corresponding to different letter sizes.


What's the difference between a pocket, wallet and banker envelope?

Wallet and banker envelopes both open along the longer side, with the banker opening with a large ‘V’ shaped flap and the wallet with a shorter, squarer flap.

Pocket envelopes open along the shorter side, with a short flap.


Pocket, wallet and banker envelopes


Envelope seals

There are three main envelope seals:

  • Gummed. Adhesive flap is moistened and stuck to back of envelope.
  • Twin gummed / press seal. Two adhesive flaps are pressed together. Sometimes press seal envelopes are reusable and can be opened and closed repeatedly.
  • Peel and seal. Protective paper covers an adhesive strip on the flap. This is peeled away to stick the flap on the back of the envelope.