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Do Not Bend envelopes are perfect for sending important documents in the post that need to be kept flat such as documents, certificates, photos, and other flat items. Designed to keep your items safe and well protected during transit, these envelopes are manufactured with a rigid 600gsm backing board and a 120gsm paper front. Available in a range of popular sizes in classic white and manilla, all our Do Not Bend envelopes are supplied in boxes for neat and convenient storage.