If you don't want your documents to be bent during shipping, these cardboard-backed envelopes are the right choice. The sturdy backing provides ideal protection for your shipment. You can also easily seal the shipping bags: simply peel off the protective strip that prevents the adhesive from drying out and collecting dust, seal the envelope, and your shipment is ready to go. The white shipping envelopes with cardboard backing in C4 size are made without wood and have no window, allowing you to write or stick the recipient's address directly on the envelope. Features: Color: white, no window, self-adhesive.