450mm x 324mm Rigid Board Kraft Envelopes 350gsm (Qty 100)Introducing our 450mm x 324mm Rigid Board Kraft Envelopes, crafted from robust 350gsm Kraft board to ensure your items are well protected during transit. These large rigid mailers are perfect for safeguarding A3 sized documents, artwork, photographs, and other delicate items from bending or damage. Each pack contains 100 high quality cardboard envelopes, providing a reliable and eco friendly packaging solution for businesses and individuals alike.