Tamperproof packaging having an inner envelope and an outer envelope

Packaging comprising a rectangular parallel-epipedal molded plastic inner can having a capacity of about one to five liters and having elongated stiffening grooves molded therein, the can having relatively large opposite side walls and relatively narrow opposite end walls and top and bottom walls and having a neck surrounding a discharge opening, the neck being disposed in an upper corner of the can on a length of wall of the can that extends between a said end wall and said top wall and that is disposed at an acute angle to a vertical axis of the can, the opening having an axis disposed at an angle of about 15.degree. to 30.degree. to said vertical axis of the can, a stopper for opening and closing said opening, the can having over most of its extent a thin wall that is about 3/10ths of a millimeter thick but having a thicker wall adjacent said neck, and a cardboard outer envelope closely surrounding and contacting and supporting the can, the envelope being of a single piece having fold lines that define rigid panels, the envelope having a portion through which said stopper is visible but through which said stopper cannot be removed without destruction of a portion of the packaging.