General description These strong board backed envelopes are designed to securely contain unfolded paper, making them ideal for posting and storing important documents such as certificates, legal documents, passports, ID cards, photos, artwork, gift cards, and currency. The rigid board back provides excellent protection against bending and creasing, ensuring your items remain flat and safe during transit. Technical specifications Size: C5/A5 (229mm x 162mm) Material: Strong 120gsm brown kraft paper (front) & board (back) Usage Perfect for mailing important documents that need to remain flat and undamaged. Each envelope features a built-in peel & seal strip for easy sealing, reducing packing time and cost. "Please do not bend" is printed in large red font on the front to caution handlers.