Sterile disposable flasks reduce the chance for cross contamination. Ideal for shaker and suspension cell culture, media preparation or storage. Made of light, crystal clear PETG plastic with a baffled bottom. Molded-in graduations. Leak-proof high-density polyethylene screw closures open to vent with 1/4 turn. Flasks offer a 5-year shelf life, a 10-6 SAL, are non-pyrogenic and non-cytotoxic. Individually packaged for easy storage and handling.