The Everest & Jennings O2 Holder Bag is a versatile, soft-sided carrier designed to hold "D" or "E" oxygen cylinders. Unlike rigid metal holders, this bag is made of heavy-duty, water-resistant nylon and attaches to the back of most manual wheelchairs using adjustable reinforced straps. It features a convenient top opening for easy tank insertion and a small storage pocket for tubing or a wrench.