C2 Board Envelopes are a great option for sending large flat items such as photographs, prints or posters. The premium white all board outer gives a smart professional look and offers all round protection for your items, it’s also printable and perfect for sticking self-adhesive address labels. These cardboard envelopes feature a peel and seal strip and pre-folded crease for efficient packing, and the peel-open strip makes opening the envelope just as easy.