Casing and packaging for obviating kohlensaeurehaltige enke

摘要

A thin-walled nestable plastic container of the type having a tapering cylindrical wall is provided with an expansible bottom employing a central conical portion projecting upwardly into the container. The central conical portion is arranged to invert under pressure so that the cone decreases in height as it turns inside out. The base of the cone remains circular as the cone inverts and thereby provides a stable base on which the container can rest. The cone is not intended to invert completely and consequently, the apex of the cone is preferably stiffened by thickening of the wall.