Abstract: A box of molded plastic material for packaging or storage of various objects has a box body of polygonal cross-section which may be square, for example, and a closure lid. The different sides of the box are provided with complementary male and female guides of dovetail shape, for example. The guides of one of the two series have a stop at one end. The arrangement is such that a variable number of boxes of this type can be assembled side by side so as to constitute a single-unit assembly. The boxes can be employed for individual packaging of various objects or products such as make-up products, for example.