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Bestselling Envelopes

Envelopes – A Guide to 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, C5, C6 and DL and these correspond with the most common stationery sizes which are A4, A5, A6 and compliment slip size.

Envelope and stationery sizes

 

Envelope size Dimensions Extra information
DL DL Envelopes DL envelopes hold an A4 sheet folded twice into three parts.

This size is classed by Royal Mail as a small letter if...

It's under 100g
It's under 5mm thick

The costs for a small letter are 60p First Class and 50p Second Class.
C6
C6 Envelopes C6 envelopes hold an A4 sheet folded twice in quarters or an A5 sheet folded in half.

This size is classed by Royal Mail as a small letter if...

It's under 100g
It's under 5mm thick

The costs for a small letter are 60p First Class and 50p Second Class.
C5 C5 Envelopes C5 envelopes hold an A4 sheet folded once down the middle, or an unfolded A5 sheet. This is a more common size than C4 and more common for sending letters and branded stationery.

This size is classed by Royal Mail as a small letter if...

It's under 100g
It's under 5mm thick

The costs for a small letter are 60p First Class and 50p Second Class.
If it's thicker or heavier please refer to the large letter guide below.
C4 C4 Envelopes

C4 envelopes hold an A4 sheet unfolded. They are just slightly bigger than an A4 piece of paper or stationery, enabling them to carry a brochure or catalogue.

This size is classed by Royal Mail as a large letter. As long as the dimensions aren't any larger than C4, the cost depends on the envelope's weight. The First Class costs for a large letter are as follows:

Up to 100g          £0.90
101g - 250g        £1.20
251g - 500g        £1.60
501g - 750g        £2.30

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.

Did you know?

  • DL = 110x220mm = 4 1/3 x 8 2/3 inches
  • C6 = 114x162mm = 4 1/2 x 6 3/8 inches
  • C5 = 229x162mm = 9 x 6 3/8 inches
  • C4 = 324x229mm = 12 ¾ x 9 inches