The Go Flow Water Gravity Bag is the ultimate filtration system that is lightweight and will go anywhere you go. The simple design enables the maximum amount of filtration, while providing a convenient and uncomplicated experience. It is compatible with the Versa Flow Ultra-filtration Hollow Fiber filter. It is also compatible with other gravity style filters. Made from food-grade Thermoplastic Polyurethane Plastic (TPU) which is waterproof and strong. TPU's flexibility allows for better containment and cleanability. The quick release valve is fused into the TPU preventing any leaks. Located on the side of the 10 liter storage capacity water bag, the placement allows unwanted sediments to fall to the bottom of the bag and not enter into the filter. This reduces the chances of clogging the filter. Does not include HydroBlu Versa Flow Water Filter.