Maximize protection and water throughput with this ultralight, compact gravity water filter system built to provide safe drinking water in almost any environment. The LifeStraw Flex with gravity bag offers advanced filtration for protection against bacteria, parasites, and microplastics in addition to lead, chlorine and other contaminants including sand, silt, and cloudiness. The gravity bag features a leak-proof hose connector and a convenient shoulder strap for easy transport and flexibility to hang virtually anywhere. It is also compact and portable, making it ideal for hiking, camping, and survival. Your purchase has impact. For every LifeStraw product purchased, a school child in need receives safe water for an entire school year.