Abstract: The subject invention, like prior two-way envelopes, relates to a remailable envelope formed from a blank which is symmetrical about its center line. The blank consists of three panels that are connected along fold lines: the front panel of the envelope, the back panel of the envelope and a third panel which is the resealing return flap. The front panel has a top flap and a pair of opposed side flaps that are used to construct the envelope. In addition, the front panel contains a viewing window for the original addressee and a return window for the return addressee. The resealing return flap is connected to the back panel by a fold line extending along the top edges of the back panel and resealing return flap and, for the initial mailing, is also attached to the back panel with weak adhesive spots that permit easy detachment for the return mailing. The resealing return flap contains a strategically placed window that is covered by the top sealing flap of the envelope during the initial mailing.