These rigid cardboard envelopes by ColomPac are made from an excelllent quality corrgated board. For the safe despatch of books, photos, cd's, brochures, catalogues and much more. The self adhesive strip allows quick and easy sealing, and the tear off strip means the envelope is opened without fuss at the other end. The envelopes will expand to take thicker contents. The envelopes are bend resistant and have all round reinforced edges. Available in 3 popiular sizes - A5, A4+, and A3.