Abstract: A flat blank formed of transparent, synthetic plastic material which when erected creates an open bin that is readily secured to the front edge of a supermarket shelf to enlarge its capacity to store and display additional merchandise. The blank is constituted by a rectangular base panel whose opposing long sides are joined by living hinges to the corresponding sides of rear and front panels, the opposing ends of the rear panel being joined by living hinges to end panels. By folding up the front and rear panels and swinging in the end panels and latching them to the front and base panels, a three-dimensional bin is created whose rear panel can then be adhesively attached to holding clips received in the existing price channel at the front edge of the shelf.