Abstract: A web comprising two end-to-end series of bags of synthetic plastics material is disclosed. The bags of each series are joined to one another by structures comprising weld lines and lines of weakening. The two series are joined to one another by a structure comprising either a line of weakening or a line of weakening with welds on each side thereof. The web is constituted by a tube which is extruded with two sets of inter-engagable ribs. Each series of bags is punched with a row of tractor holes. In another form there is a single end-to-end series of bags.

Abstract: A box having side walls (10, 12, 14, 16), a first set of panels (20, 22, 24, 26) along the top edges of the side walls and a second set of panels (28, 30, 32, 34) along the bottom edges of the side walls. The first set of panels overlap one another to form a box top and the second set of panels similarly overlap to form a box base. The first set of panels are so shaped that the box top has some areas which are above the level of the remainder of the top. The panels forming the box base also provide areas which are above the level of the remainder of the base. Said areas of the top and base are of the same shape and layout so that when two boxes are stacked, said areas of the top are received in said areas of the base.