A strong, professional mailing solution for sending important documents, certificates, photographs, prints and artwork safely through the post. These C4 rigid board envelopes are designed to keep contents flat and protected, making them ideal for A4 documents that need to be sent without folding. Made from strong board to help protect contents from bending, creasing and damage during transit. C4 size envelope designed for A4 sheets, certificates, prints, documents and paperwork sent flat. ⚠️ For very delicate prints or photos, we recommend adding an extra protective sheet before sealing. These C4 all board rigid envelopes offer a great balance of strength, presentation and convenience. The rigid board helps keep contents flat, while the peel & seal closure makes packing quick and simpl.