Overpack which is unfoldable from a flat folded layer to form a polygonal three-dimensional shape and which forms a circumferentially closed ring (8, 38), having vertically standing side walls which are connected to one another via jointly formed corners of the three-dimensional shape, the side walls having, in their vertical extent, a division into a lower and an upper side wall, and - support strips extending around the corner are plugged onto upper edges of the lower side walls in at least two or more corner regions, - the support strips have clamping plates formed on their inner and outer edges (16, 18) and extending in an upward and downward direction from a strip plane, - the downwardly directed clamping plates bound between them an insertion channel which follows the extension of the support strip and into which the lower side walls, which form a closed ring (8, 38), are unfolded from a flat folded layer to form a three-dimensional shape, are located below the strip plane and are connected to one another via this jointly formed corner, are inserted, - the upwardly directed clamping plates bound between them an insertion channel which follows the extension of the support strip and into which the upper side walls, which form a closed ring (8, 38), are folded up from a flat folded layer to form a three-dimensional shape, are located above the strip plane and are connected to one another via this jointly formed corner, are inserted, - wherein the length dimensions and the three-dimensional shape of the side walls located below and above the strip plane correspond to one another, so that the side walls arranged one above the other and connected to one another by the support strips form a common overpack with respectively jointly formed planar outer surfaces, characterised in that the clamping plates formed on the inner and outer edges (16, 18) are each spaced apart from adjacent clamping plates arranged on the same side of the inner or outer edge (16, 18), and the clamping plates formed on the inner and outer edges (16, 18) opposite one another are each arranged offset from one another. - support strips extending around the corner are plugged onto upper edges of the lower side walls in at least two or more corner regions, - the support strips have clamping plates formed on their inner and outer edges (16, 18) and extending in an upward and downward direction from a strip plane, - the downwardly directed clamping plates bound between them an insertion channel which follows the extension of the support strip and into which the lower side walls, which form a closed ring (8, 38), are unfolded from a flat folded layer to form a three-dimensional shape, are located below the strip plane and are connected to one another via this jointly formed corner, are inserted, - the upwardly directed clamping plates bound between them an insertion channel which follows the extension of the support strip and into which the upper side walls, which form a closed ring (8, 38), are folded up from a flat folded layer to form a three-dimensional shape, are located above the strip plane and are connected to one another via this jointly formed corner, are inserted, - wherein the length dimensions and the three-dimensional shape of the side walls located below and above the strip plane correspond to one another, so that the side walls arranged one above the other and connected to one another by the support strips form a common overpack with respectively jointly formed planar outer surfaces,