Abstract: A self-sealing envelope in which the opening is defined between a taller flap and a shorter flap and the height of the shorter flap is such that when a protective peal-off tape is removed from a band of pressure sensitive material extending across the taller flap, the upper end of the shorter flap adheres to the lower region of the pressure sensitive band to seal the closure, leaving exposed the upper region of the adhesive band so that when the upper end of the envelope is folded down above the contents, the exposed adhesive band will adhere to the surface of the envelope across the width of the taller flap.