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Our Large Letter Cardboard Envelopes are available in over 35 sizes to suit all needs. These envelopes conform to the sizes set by Royal Mail for sending large letters. We offer a range of large letter size cardboard envelopes in brown, manilla, or white. This range includes Board Backed Envelopes, All Board Envelopes, ColomPac® envelopes, MailJacket™ and MailJacket™ Lite. All of our large letter cardboard envelopes feature a handy peel and seal adhesive closure, which means they are quick to pack and secure in the post.
