finished form fig5 shows the top view of the receptacle shown in fig4 towards the arrow v fig6 shows a receptacle in compressed state after being emptied according to fig1 the packaging material 1 is rectangular in form and is laid out in one length it consists according to fig1 and 2 of a pure metal sheet 2 to which a plastic coating 3 is applied on all sides the plastic coating 3 projects with a margin 4 over the margins of the metal sheet 2 the metal is thus protected from rusting to shape the receptacle the packaging material is folded along the lines 5 so that a receptacle 6 as shown in fig3 is produced in an initial stage the top and bottom strip 7 of the packaging material forms in part the top and bottom closure of the receptacle 6 and the surplus material is shaped into flaps 8 according to fig4 the flaps 8 are folded in they can be welded to the actual receptacle 6 by means of the plastic skin the flaps stay close to the receptacle without any special attachment however even after being folded upwards on account of the characteristic of the material the overlapping inside and outside surfaces of the edges 4 a and 4 b are also welded to one another the top and bottom margin 9 of the packaging material also overlap after the folding.