Envelope Guide

In: Guides and Useful Information On: Friday, October 16, 2015 Comment: 0 Hit: 1912

A guide to purchasing envelopes. Which size should you choose? Gummed or glued? What weight?! All your questions answered!

What size envelope do I need? What about gummed or self-adhesive? What on earth does the weight of an envelope mean?!

These are some of your questions we answer on a daily basis, so we thought it would be useful to many of our customers to write a guide to the envelopes that we stock, to assist you in your purchasing decsions and choosing the correct envelope for the job. After all, being specialists in stationery we recognise that using the right envelope is just as important as using the right paper!

As well as providing protection, an envelope also becomes an extension of your company's image as much as the content inside the envelope. Envelopes are a simple way to add value and prestige to the image of your company.

Our comprehensive range of envelopes are designed to meet all your mailing needs, from superior quality, high white envelopes to cost effective manilla suitable for volume mailings. In addition, you'll find a comprehensive selection of different weights, sizes and materials designed to provide specific benefits from added protection to increased security.

Step 1: Find the right seal

Self Seal


If you’re not a big mailer and don’t mind the taste, gummed envelopes are a good choice. These are the least expensive option, they’re ideal for general use and you can leave them lying in your desk drawer for years and years.

Self Seal

Self Seal

Self-seal envelopes are designed for people who mail a lot. They’re fast and easy to use and there’s no licking required. But remember, since the glued surfaces are not protected they will dry out when left lying around, so they should be used within 9 months.

Self Seal

Peel and Seal

Just peel away the protective strip and fold the envelope shut. It’s quick and easy and the seal is very strong. The strip prevents the glue from drying out so buying more than you need won’t be a wasted investment.

Step 2: Find the right size

As we all know that unfortunately postage costs go up with size, sometimes there is no choice but to utilise a bigger envelope to allow you to send documents without folding them first, which is a must for certain items sent through the post.

We've created the chart below to give you a reference as to what size envelope you might require.

Envelope Sizes

Step 3: Pricing in proportion

The new Royal Mail postage system is based on the weight and size of an item being mailed. The following diagrams show how an item being mailed is classified:



C5+ or under - up to 100g - less than 5mm thick. Examples of mail items: standard letters, postcards, bills, greetings cards


Large Letter

B4 or under - up to 750g - less than 25mm thick Examples of mail items: letters containing unfolded A4 paper, most brochures, CDs, DVDs, company reports


More than 353mm long or 250mm wide. More than 250mm thick. Examples of mail items: most books, VHS cassettes, most cylindrical packages, parts and samples



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