The Small Ozone-Resistant Teflon Bag is made of 100% Teflon (PTFE). Teflon doesn't break down under ozone, and the bag can contain ozone to a small area. It is 12 inches by 13 inches. To seal it while in use, you can use a Velcro strap or medical tape (not included). The included fitting works with tubing that has an inner diameter between 3/16 and 1/4".
A larger 25"x12" is also available.