How to choose your envelopes

Envelope Guide

Envelopes are a vital fixture in the office stationery cupboard. These everyday essentials help keep confidential documents private and transport important information from one place to the other.

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Most envelopes come in two standard orientations:

Pocket or Wallet Envelopes vary in weight from a lightweight 70 grams to a heavyweight 130 grams. Heavyweight envelopes are stronger and offer greater protection. They also create a great first impression.

What size of envelope do you require?

C4 Size

It’s slightly bigger than the size of an A4 sheet of paper and perfect for sending documents without folding them.

C5 Size

The traditional-sized envelope. Bigger than the size of an A5 sheet of paper or for an easier reference, an A4 piece of paper folded in half.

C6 Size

They’re not seen as much in the post-box as other envelopes, but it’s still worth keeping a supply to hand. Normally, C6 size envelopes are used to send smaller items.

DL Size

You’ll probably receive DL-sized envelopes in the post all the time. Pages are folded into thirds with DL envelopes and are suitable for one to three-page letters.

What type of envelope do you require?

Gusset Envelopes

Expandable envelopes are for sending bulky items.

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Board Backed

Hard backed envelopes are for sending items which need to remain flat.

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Coloured Envelopes

Coloured envelopes are for those special occasions.

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High Security

Security envelopes are tear and burst resistant, offering protection for important documents.

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Polythene envelopes are light and strong and ideal for mail order.

View Polythene Envelopes


A cost effective way to hand wages and wage slips out to employees.

View Wage Envelopes


The size and position of the window is always described with flap upwards. Window size is measured height (A) x width (B). Window position is measured by the width in from the left-hand side (C) and the height up from the base (D).

View All Window Envelopes

Choosing different sealing options...

Peel & Seal envelopes with POWER-TAC adhesive for an exceptionally strong seal.

View Power-Tac

Easy Open envelopes feature a built-in tear strip allowing the recipient to open the envelope quickly and easily without damaging contents or compromising security.

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