Nalgene™ polycarbonate Clearboys™ with spigot and space-saving rectangular shape. All sizes feature molded-in graduations. Polycarbonate is autoclavable, window-clear and has high impact strength; good for cold room use. Leakproof. Polypropylene spigot closure (Cat. No. 7-6423-0010) included. NOTE: Autoclave only when empty. Before autoclaving, just set cap or closure on top of the container without engaging the threads. Dismount and disassemble spigot before autoclaving.