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For maximum protection and convenience when disposing of biohazardous wastes, Clavies?é?« transparent, autoclave bags are made of 0.05mm (0.002") thick polypropylene. Fill the bag with used Petri dishes, membrane filters, culture plates, pipettes, etc., then autoclave and discard. The three largest sizes holds 65, 200 and 240 standard Petri dishes respectively. Steam autoclavable at 121°C (250°F).