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:

• C4 (equivalent to A4 paper size)
• C5 (equivalent to A5 paper size)
• C6 (equivalent to A6 paper size)
• DL (fits a compliment slip)

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

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.