Designed for mammalian suspension culture applications as well as bacterial & yeast culture PETG available with either vent or solid cap to prevent common mistakes made with combination caps such as sealing the cap completely and preventing gas exchange Polycarbonate available with vent cap only Vent caps with over-sized vent area feature 0.22µm hydrophobic membrane which allows for improved gas exchange without contamination Avoid contamination with single-use, pre-sterilized flasks Lightweight material is easier to handle than glass Flasks include molded graduation lines Individually bagged for easy storage and handling Medical grade virgin PETG reduces gas permeability (12 per CS)