A film-supporting device is used with a waste-disposal unit.A central opening of the device in atransverse plane of the device has variable diametricaldimensions with a first diameter of greater dimension than thesecond diameter. The outline of the central opening has ashape optimized for receiving tubular film and fortransportation costs, by having two of the first diameter ofgenerally equal dimension and two of the second diameter ofgenerally equal dimension, with the first diameter being themaximum diameter of the outline in the transverse plane, andwith the second diameter being the minimum diameter of theoutline in the transverse plane. The device has tubular filmabout an outward radial surface of the annular body. The freeannular end is closed to form a bag. The opening of the bagis accessible through the central opening.
