Abstract: A two-panel easy-opening reusable envelope for use in an outward journey from a sender to a receiver followed by a return journey from the receiver to the sender or some other person includes a first panel, a second panel, and a reuse flap, the reuse flap being connected to the first panel along a first foldline. The reuse flap has a free outer edge and a first attachment portion for sealing the envelope during the outward journey, a second attachment portion for sealing the envelope during the return journey, and means enabling separation of the first attachment portion and the second attachment portion. The reuse flap includes a first adhesive strip located on one of the second panel and the first attachment portion between the means enabling separation and the outer edge of the reuse flap for sealing the reuse flap to the second panel before the outward journey of the envelope.