Abstract: An envelope including: a front sheet and a back sheet coextensive and overlapping the front sheet; a pull tab formed in the front sheet between lines of weakness in the front sheet, wherein the pull tab includes a front tongue having an edge defined by a line of weakness in the front sheet and extending between the lines of weakness; heat seals between the front and back sheet proximate to the perimeter of the envelope; a release sheet on adhesive coated side of the front sheet, wherein the adhesive coated side is opposite to a side of the back sheet facing the front sheet, and a slit through the release sheet and the back sheet along a line parallel to an edge of the envelope.