Abstract: A positive interlocking arrangement between two container parts connected pivotably by a joint essentially consists of circular edges in side walls of one part of the container and grooves which are provided in the circular edges and which are engaged by counter-pieces on the other container part which are in the form of sloping surfaces or steps. The container parts can be separated only in the region of a predetermined angle of rotation, in particular in the vicinity of the closed position of the container. Provisions for limiting rotation can advantageously be combined with the interlocking devices. The positive interlocking arrangement can be used for any container which consists of rectangular molded components essentially connected pivotably to one another.