US Patent 10384831 Container assembly including removable secondary container

A container assembly including a primary container and a secondary container removably attached to the primary container. The primary container includes a top, a bottom and a side. The side includes a recess in which the secondary container is located when attached to the primary container. The recess is defined by two side walls extending laterally from a rear wall of the recess toward an outer surface of the side wall. The secondary container includes a top, a bottom and a side. The secondary container is attached to the primary container through a set of securing attachments, each including a protrusion and mating indentation. At least one of the walls of the primary container and the side of the secondary container includes the set of protrusions, and the other of the walls of the primary container and the side of the secondary container includes the set of mating indentations.