Abstract: A receptacle is formed from an appropriately scored blank by mechanical folding and set-up prior to its being filled, and for mechanical closure of the self-contained cover members after the filling of the receptacle.

Abstract: A receptacle having a self-locking closure is formed by fold assembly of an appropriately scored single piece blank. The receptacle formed from the sheet material blank includes forward, rear and opposed side walls connected to a bottom and providing for an upwardly facing opening. Corner gussets provided for on the blank are foldable in opposed relation along the outside face of the forward and rear walls of the receptacle. The blank further includes a projecting flap and first locking tab on the forward and rear walls with the flap being foldable outwardly and downwardly to hold the opposed gussets in place while the first locking tab is foldable upwardly under the opposed gussets to provide for lasting securement for the receptacle in an open condition. Closure flaps for the receptacle are provided on the opposed side walls and are foldable downwardly over the receptacle opening in overlapping relation.