Abstract: A refuse bag joined at three straight sides and an open fourth side which includes projecting tie parts that can be readily tied by hand. The tie parts are each rounded peaks separated by convex valleys. Each peak has side portions and a top which has a convex part including convex transitional portions connected to the side portions which otherwise connect to the valleys. Preferably, the peaks and valleys form a sinusoid.

Abstract: Continuous rolled material is described which is formed as lay flat tubing and which has lines of perforations running transversely to the axis of the material and dividing the material into discrete units. Alternate lines of perforations are sinusoidal lines. There are cuts in these lines of perforations at the mid-portions between the crests of the sinusoidal lines. The remaining perforations are arranged so that the transverse components of their lengths are substantially constant. Other kinds of perforated continuous material are also described.