Both the 8-liter gravity bag and the 8-liter storage bag are completely leak-proof, allowing for mobility. The Safe-Water storage bag features a special screw spout for quick pouring and a hose connection for added functionality and versatility. You can even remove the filter from the gravity bag and use it as a straw on the go, connect it to a water bottle, or use the included stopper to halt the flow and utilize it as a second storage system. The filter size of 0.2 microns filters out 99.999999% of bacteria, 99.999% of parasites, and the same amount of microplastics. The water storage bag is made from high-quality, BPA-free materials (without plasticizers) that ensure long durability. Enhanced microfilter performance: The revised membrane and special backwash accessories provide better performance against sand and silt, maintaining flow over extended periods. The membrane microfilter lasts up to 2000 liters. Included in the package: LifeStraw Peak Series 8L gravity bag with hose and standard quick connector, carabiner, leak-proof cap for water storage, easy carry strap, LifeStraw Peak Series 8L safe water storage bag, screw cap, backwash accessories, user manual. Your purchase makes an impact: 1 purchase = 1 year of clean water for a child (LifeStraw's Doing Good Program).