Abstract: A thermally reflective liner for providing thermal insulation within a container. The liner includes four long panels which are joined along their long sides forming a tube of approximately rectangular cross section; an end panel which seals the end of the tube; a tie for closing the tube, such that total thermal insulation can be provided to the enclosed space within the liner; a plurality of loops provided along the long seams of the liner; and at least one piece of webbing material which can be threaded between the plurality of loops on the liner and a plurality of hooks on the container to retain the liner within the container, such that an air gap is provided between the sides and top of the liner and the container.