Cardboard envelopes are used to secure and protect paper mailings. They combine the function of an envelope with the durability of a cardboard box. Cardboard envelopes are very sturdy, so they adequately protect the shipment during transport. The rigid binding protects the mailings from tearing and creasing, ensuring maximum protection for the mailings during dispatch. The envelopes are available in a variety of formats to accommodate documents and small items such as books or advertising material.