It is a matter of a container assembly with at least one stackable container (1) which has a bottom part (7) and a lid (8) mounted on top thereof Several containers (1) may be so stacked that the lid (8) of the lower container (1) is located between two bottom parts (7). The container (1) is equipped with at least one connecting device (3) which has coupling means (26) mounted movably on the lid (8) of the container (1). The coupling means (26) are movable, for the connection of two containers (1) mounted one above the other, into a connected position relative to the lid (8), in which they are simultaneously in connecting engagement with the bottom parts (7) of both stacked containers (1).