These Manilla board backed envelopes are 267mm x 216mm and are ideal for mailing certificates, CDs, photo prints, documents and other items with the necessary protection from corner damage and bending in transit. These envelopes are printed with “Please Do Not Bend” on the front and come in boxes of 125. Our board backed envelopes are manufactured with a strong 120gsm Manilla paper attached to a rigid 600gsm cardboard backing sheet to prevent folding, bending and corner damage in transit. Strong peel and self-seal closure makes for faster packing and high quantity boxes help them arrive with you in excellent condition, store well for longer and allows you to stock high quantities of document enclosed envelopes in minimal space.