Abstract: The present invention provides a heavy-duty, multi-wall or multi-ply bag having gusseted sides and overlapping upper sealing edges of the pinch seal type, wherein a quick-opening construction is provided for such bag. The quick-opening construction consists of (a) a slotted portion formed of one or more slots in the outer wall of the bag, within the gusset and adjacent the upper sealed portion of the bag, and (b) a transverse perforated section on the inner wall or walls (plies) of the bag and disposed substantially intermediate the slots in the outer wall. The outer wall may be torn by fingers engaging the slots, and the inner wall or walls may be penetrated by fingers entering the perforations. The entire upper corner of the bag may be hand opened to provide a funnel for quick delivery of the contents.