Abstract: Described herein is a portable display system including a collapsible frame comprised of a plurality of box units defined by spaced hubs with pivotable members extending therebetween. In one aspect of the invention, a locking feature is provided between the members and the hub. In another aspect of the invention, a hook-type mounting between the members and the hub is described. More than one of these display systems can be mounted one to another with a clip that is provided between adjacent outward-most hubs of two different systems. A cage also is described, which permits assembly and disassembly of the collapsible unit into two separate packageable parts. A button also is disclosed which permits two parts of the display to be mounted removably to another.