Vented cell culture flask. Applications include cell culture and sample or reagent storage. Vented cap: biologically inert, high density polyethylene provides a chemically resistant surface. 0.2 Micrometer hydrophobic membrane allows gas exchange while maintaining sterility. Hydrophobic membrane cannot be wetted out. Precision engineered to spin on quickly. Molded in graduations along both sides of flasks allow quick volume estimation 25 to 325 ml in 25 ml increments. Prominent stacking rims along perimeter of upper and lower surfaces permits easy interlocked stacking in incubator or culture hood. Flasks will not slip off one another while being transported. Tissue-culture-friendly packaging convenient reseal tab on the bag. Innovative bag materials that will not scuff or scratch the flask surface. Double-wall bags provide increased sterility assurance. Medical-style peel-open bags guarantee that sterility is maintained as flasks are removed from the bag. Recyclable bag material (low density polyethylene). Sterility. compliance. Material: crystal grade polystyrene. 150 Square centimeter growth area. 600mL Volume. Neck measures 1-3/64" ID by 1-1/64" length. Cap material: blue high density polyethylene.