Containers

Claim 1

A nestable container which consists essentially of: a base; a side wall integral with and upstanding from the base to define with the said base a reservoir for liquid, the side wall diverging generally upwardly from the base; a lower side wall portion and an upper side wall portion, a first annular shoulder which joins together said lower side wall portion and said upper side wall portion; a second annular shoulder, essentially horizontal, formed in the inner surface of said upper side wall portion; a rim on top of said upper side wall; a plurality of spaced apart axially extending ribs disposed on the outer surface of the upper side wall portion and extending said ribs on said outer surface below the level of said inner second annular shoulder; said annular shoulder formed in the inner surface of the said upper side wall portion so that when formed into a stack the ribs on the outer surface of one container rest on the inner second shoulder of the container below it in the stack, the angle of inclination of the said ribs being the same as the angle of inclination of the of inner surface of the upper side wall portion above the second shoulder, the outer surface of the lower side wall portion of one container adjacent the base engaging the inner surface of the lower side wall portion of the container below it in the stack adjacent the first annular shoulder thereby to form a powder seal, and the cups when nested together to form a stack being freely rotatable one inside the other.