An over-pack container for an industrial drum has a body portion with an outwardly extending flange thereon that has a flat outer surface of a polygonal shape and an inwardly extending upper lip that terminates as a downwardly depending leg with threads on the inner surface thereof. A hollow lid has...http://www.google.es/patents/US5358133?utm_source=gb-gplus-sharePatente US5358133 - Over-pack container for an industrial drum
