Abstract: A rectangular envelope for square articles includes a rectangular front panel having a pair of shorter edges and a pair of longer edges. A sealing flap is attached to one of the shorter edges and a back flap is attached to the other shorter edge, A pair of side flaps are attached to the longer edges. The side flaps are folded along the longer sides over the front panel. The back flap is folded along the other shorter side over the front panel and the folded over side flaps. A filler sheet is disposed between the back flap and the front panel adjacent said other shorter edge and between the folded over side flaps. The filler sheet is adhered to the front panel and the back flap. The back flap is adhered to the side flaps. The filler sheet defines a substantially square article holding envelope portion between the filler sheet and the first shorter edge of the front panel.