C5 white board backed envelopes are boxed in 125s and are perfect for A5 sized photos, certificates and documents and of course for all A4 letters and documents that can be sent folded in half. These envelopes are manufactured with a rigid 1000 micron backing card and a strong 120gsm plain white paper for excellent presentation and high-levels of protection against damage, bending and folding, reducing returns and keeping your customers happy. Peel and self-seal closure and a wide, flexible opening help make board backed envelopes fast to pack and flat packing in high quantity boxes enables you to store high quantities in minimum space. Order today and save with our accumulator saver box rates, free samples can also be ordered should you wish to try before you buy - if you need any help then please Contact Us