Self-sealing chipboard mailers have a flap with an adhesive strip that seals the mailer. They have a strip to pull that tears open the mailer. Chipboard mailers are stiff and prevent the contents from folding or bending during shipment.

Tab-locking chipboard mailers have a tabbed flap that folds over the opening. The tabs lock into slots to close the mailer. The tabs allow the mailer to be opened and reclosed, making the mailer reusable. Stiff paper prevents contents from folding or bending during shipment.