Standard Pack = 1 piece(s). Molded from industrial-grade polymers, these bins are resistant to weak acids and alkalis, and they're waterproof, rustproof, and corrosion proof. They securely stack atop each other, too, and can sit on shelving, carts, and dollies. And their reinforced side ribs and extra-Wide stacking ledges provide stability and prevent spills and spreading when stacked. Other features include Large label areas for easy identification.