Abstract: A multiple-use, sealable flat envelope has a body of spunbonded olefin sheet. The body has one side edge with a mouth opening and a spunbonded olefin sheet closure flap extends continuously in one piece from the body on one side of the mouth opening. The flap has an inner surface facing and overlapping an edge portion of the body adjoining the mouth opening when the closure flap is folded back toward the body and fully extended over the mouth opening and against the body to close the mouth opening. Two adjoining but separate and spaced apart hot melt, pressure sensitive adhesive closures are provided on the spunbonded olefin sheet of the envelope proximal the mouth opening. One adhesive closure is located farther from the mouth opening than is the remaining adhesive closure.