Our C6 Board Envelopes are useful for sending small flat items such as photographs. These board backed envelopes are available in manilla or white and follow the Royal Mail’s letter size regulations. The strong board back and paper front will prevent your items from bending or folding, while also being lightweight enough to keep postage costs down. The speedy peel and seal adhesive strip makes packing quick and easy. They’re available in handy boxes of 250 envelopes for optimal storage.