FIELD: packing. SUBSTANCE: according to invention, first wall has locating lip with narrowed section hinge connected by base to first wall, and widened section. Second wall has holding lip forming locating hole. Holding lip is displaced from plane of second wall to receive locating lip through locating hole and it thrusts against section of locating lip projecting beyond widened section. Locating edge of locating lip is made on each opposite side edge of widened section for relative engagement with wall section of second wall arranged adjacent with additionally bent edges of locating hole for holding first and second walls in overlapped fixed position. Invention provides means for relative location of walls which does not lead to deformation of locating lip in process of fixing and makes it possible to easily reveal incomplete fixing. Moreover, as locating lip is wider than known locks, improved interaction with fixing pin of packing machine is provided. EFFECT: prevention of incomplete engagement of locating and holding lips. 16 cl, 4 dwg
