Corning polystyrene Storage Bottles are now available as closed system solutions. They are sterile and arrive individually double-bagged and peassembled. The preassembled transfer caps have two ports. One port ends in a 0.2 µm filter, and the other port is chemically resistant, heat sealable flexible tubing, ending in a Male MPC. The dip tube reaches all the way to the bottom of the flask for easy aseptic transfer of your liquid handling processes.