These Manilla board back envelopes have been developed with you and your business in mind – the ultimate protection from bumps and scrapes in the post for your documentation, photos, catalogues and much more. Produced with a 120Gsm board backing and a peel and seal strip for easy closure, these sturdy C5 do not bend envelopes are the perfect option for anything that requires a bit more protection whilst in transit. We have a wide selection of board back envelopes, including options for printing to the front that reads “Please Do Not Bend” for extra peace of mind. Alternatively We have Rigid Mailers which are board finish on both sides for those extra delicate items. These are also widely used with our Mailing bags as they provide extra protection and make it guaranteed rain proof.