A display unit for displaying products in modules, the display unit formed from a single blank without the use of glue, tape or other fasteners, the shelves of which are preferably configured by passing a shelf panel in the back wall of the unit through an opening in the front wall of the display unit. The display unit, when assembled, comprises a front panel with a plurality of openings, side panels, and a back panel comprising shelf panels which extend through the openings of the front panel forming shelves. Modular product units may be placed on the shelves for product display. Each shelf may contain side walls, creating a friction fit with the product modules.