US Patent 7721566 Collapsible interconnected panels of phase change material

An apparatus having a plurality of phase change material-containing wall panels. The wall panels have a thickness and sides. The wall panels define an inner major surface and an outer major surface. The sides of the wall panels are hingedly interconnected to define a closed structure. Two diametrically opposed hinge interconnections are proximate the inner major surface. The remaining hinge interconnections are proximate the outer major surface.