Abstract: A waste material container comprising a receptacle unit, a lid therefor, a resilient gasket interposed between the receptacle unit and the lid, and a locking assembly for holding the lid in place on the receptacle unit. The locking assembly includes an abutment element on the lid, and a locking member mounted for pivotal movement on the receptacle unit, the locking member including a camming surface for engaging the abutment element during such pivotal movement to cause compression of the gasket and including an indenture for receiving the abutment element when the locking member is pivoted to its locked position, with the compressed gasket imposing a bias on the abutment member to maintain it within the indenture at such locked position.