Envelopes that stick! With businesses generally sending out far less by post, stocks of envelopes are staying around for a lot longer. So you’ll want to be sure that what you buy has the longest possible shelf life. Five year shelf life… All of our own brand envelopes have specially formulated peel and seal strips that continue to provide a strong bond for a full five years – far beyond the industry norm of up to two years. We offer a complete range of envelope sizes, with and without windows, which will carry on doing a perfect job year after …