Reinforced walls add strength and rigidity and wide top ledge permits stable, higher stacking. Made using heavy duty, virgin high-density tri-clear polypropylene that is FDA Compliant Resin. Plastic stacking bins withstand freezers and autoclaves up to 250F. Front, back and side grips allow easy handling. Molded-in full-width rear hanger lip allows bins to hang from louvered panels or rails. Anti-slide stop prevents shifting when stacked. Slotted label holders allow easy identification of contents. Sold in carton quantities. Made-in-USA.