Abstract: A packing device comprising elements which are composed of a bottom, a top panel, at least one end wall and side walls and which are hingeably connected together substantially along the longitudinal ribs of their bottoms to form a continuous row of elements. The packing device has been made from one unitary blank and the row of elements can be rolled up from its flat extended position to a closed polygonal block in which the interconnected bottoms and the combined side walls of the elements form the casing and the end faces, respectively, of the block.