Features: designed for mammalian suspension culture applications as well as bacterial & yeast culture available with either solid or vent cap to eliminate the chance of unintended venting, unlike combination caps vent caps feature 0.22m hydrophobic membrane which allows for gas exchange without contamination; over-sized vent area in cap improves gas exchange packaged sterile in individual bags for easy storage and handling manufactured from medical grade virgin petg which reduces gas permeability