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:
See the Royal Mail website for latest postal prices corresponding to different letter sizes.
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.
There are three main envelope seals: