Reinforced walls add strength and rigidity and wide top ledge permits stable, higher stacking. Constructed of water and corrosion proof polypropylene, they withstand freezers and autoclaves from -40F to 250F. FDA Compliant Resin & Colorant. Includes a full-width hanger lip for use with louvers below. Anti-slide stop prevents shifting when stacked. Slotted label holders allow easy identification of contents. Stacking bins are available in Beige, Black, Blue, Green, Red or Yellow.