Alkali Scientific’s Autoclave Sterilization Bags and Pouches are made of heavy gauge polyethylene material that offers superior puncture-resistance. This material allows the autoclave sterilization bags and pouches to contain waste at temperatures up to 136˚C. Heavy gauge puncture-resistant polypropylene Large white marking area Strong seamless bottom Biohazard symbol clear or red Available in two sizes – 12 x 26in. and 24 x 32in.