Thermal container liner for providing insulation and hook attachment for attaching the thermal container liner

A thermal container liner for providing insulation within a transportation container, the liner comprising: at least three long panels which are joined along their long sides forming a part tube or tube; an end panel attached to and sealing an end of the tube or part tube, wherein the panels together define an internal space within the liner; an attachment system provided along the upper long sides of the liner, wherein the attachment system is defined by hook attachments, each hook attachment comprising a hook for hooking onto a corresponding attachment inside the container, and a sliding base integrally connected with the hook and having a partial cylindrical enclosure, wherein in use the sliding base engages a bead at the upper joined sides of the liner, so that the sliding base can be moved along the bead to slidably adjust the position of the hook attachments with respect to the liner.