A container (10) comprising one or more walls (12, 14, 16) and a base (18) defining an enclosure for storing and displaying one or more items (90). A locking tab (22) is defined in each side wall (16) and corresponding locking slots (26) are defined in the base (18). The locking tabs (22) each define an undercut (22c). The container (10) can be mounted on top of a further container (10) to form a modular display device by inserting the locking tabs (22) of the further container into the locking slots (26) and sliding the container forwardly to engage the base (18) in the undercuts. The modular display device (34, FIG. 3) may also include a stand for supporting one or more containers at an angle on a horizontal surface and a header.