C3 Board Backed Envelopes

C3 Board Backed Envelopes are the perfect size for sending important A3 sized documents which must be kept flat during transit. These A3 do not bend envelopes combine a rigid backing board with a lightweight paper front to keep your postage costs to a minimum whilst providing excellent protection to your flat items. With a peel and seal adhesive strip closure for fast and easy packing which provides a secure seal and eliminates the need for extra adhesive, these A3 board backed envelopes are perfect for a large range of needs. Available in plain white or manilla with printed do not bend, all are packed in boxes for neat organisation.

Please note: C3 size is up to 324 x 458mm, designed to fit A3 sized items of 297 x 420mm.