These flasks have six bottom baffles to maximize oxygen transfer for bacterial, yeast and other cultures that require large amounts of oxygen for optimal growth.

• 70 mm vented cap with 0.20 µm PVDF hydrophobic membrane for sterile gas exchange while preventing contamination
• Silicone liner ensures tight seal between cap and flask
• Solid cap available for anaerobic cultures

The flasks, caps and liners are all fully autoclavable.