Abstract: The present invention relates to a disposable liner comprised of a thin sheet plastics material formed into a long tube having left and right sides and a top and bottom. The tube is closed at each end by end panels formed by folded end flaps of the tube. One end panel has located therein an inlet port and an outlet port formed of reinforced plastics sheet material in the form of tubes attached to the panel. Each port surrounds an aperture in the panel. Upper hook fasteners are located at least at the left and right top corners of the liner at both ends thereof and a lower fastener is located along the bottom edge of the liner at one end thereof. The interior surface of the end panel of the liner opposite the inlet port is protected with a flap made of reinforced plastics material.