Blake Purely Packaging C5 (A5) 229 x 162 mm Board Back Pocket Peel & Seal Envelopes (5111) White Pack of 125

Amazon

Make a difference to your mail with these Purely Packaging Board Back envelopes by Blake Heavy Duty Board Back to protect certificates, photographs, prints and more Strong Peel & Seal closure for ease of use, additional security and longer shelf life Printed 'Please do not bend' on the face for extra safety

Zoro Tools

Heavy duty board back envelopes in white and manilla, made using 1000 micron backing board and a heavyweight face paper to ensure protection when posting bendable items.