Very Versatile: This gravity water bag is compatible with SP128 Mini, SP129 Squeeze, Micro Squeeze and other common brands water filter straw. Make your own filter straw into an outdoor gravity works water filtration system High-Quality Materials: This Burtrail gravity-fed water bag is made of Food-Grade TPU materials, BPA-free, safe and ultra-durable material to ensure safe and water leakage prevention all the time Accurate Leakproof: Whole body edge of this 3L gravity water bag adopts a double soldering sealing side quilting design to withstand a large degree of squeezing. When the water pipe is inserted, it can be auto-locked fast and will not loose Quick Water Filling: Wide mouth design makes the water filling and flushing process easy and fast. Camping rope suspension system and cutable hose,making your outdoor drinking water more convenient What's in Box: 3L Gravity water bag, Camping rope, Hose, Regulator, Carabiner, Specification The Burtrail 3L Gravity Water Bag is compatible with SP128 Mini, SP129 Squeeze, Micro Squeeze and other common brands water filter straw. Reliable alternative to the original dirty water bag, wide mouth design makes the water filling and flushing process easy and fast. You can cut the hose to the length you need, then can be used connect with the filter straw. Using the camping rope to hang the water bag high up, than you'll get a gravity works water filtration system. This water bag is made of food-grade TPU materials, it's durable, lightweight, foldable, and leak-proof, providing a 3L capacity, meet the daily water needs of personal and small groups. The reliable quality of TPU compared to standard PE material ensures better durability and resistance to leakage, making it an ideal choice for outdoor enthusiasts.