C3 Manila board backed envelopes are the largest envelope in our range ideal for sending full A3 sized posters, photos, certificates and documents through the post with minimal damage. These envelopes are boxed in 50s and are printed with a “Please Do Not Bend” message on the front to help minimise damage by ensuring care is taken with the package in transit. A tough 120gsm manila paper is used for the envelope and a rigid 1000 micron backing card provides a stiff support to the item to help keep the contents protected and un-bent in transit. Secure peel and self-seal closure and a wide flexible opening make packing fast and efficient and flat packing in boxes helps the envelopes get to you in good condition and allow you to store high volumes of packing materials in minimal 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