"Ensure your water is safe to drink on your outdoor adventures with the LifeStraw Peak Series Gravity Water Filter System. This gravity-fed water filter doesn't require any pumping, so it's super-easy to use, plus its membrane micro filter protects against 99.99% of bacteria, parasites, and debris. The filter is rated to filter as much as 500 gal. of water, and the rugged, leakproof design ensures this LifeStraw water filter has a long life. An included backwash accessory blocks sand and silt, so you can enjoy strong flow over the life of the filter. The LifeStraw Peak Series Gravity Water Filter System can be used as a gravity system, large squeeze bottle, straw, or connected to a water bottle. BPA-free. The system includes a 3L bag, hose, quick connector, carabiner, cap, carry strap, backwash accessory, and manual.Manufacturer model #: LSPSFX3LAN1. Gravity-fed system doesn't require any pumping Membrane micro filter protects against 99.99% of bacteria, parasites, and debris Filters up to 500 gal. of water Durable construction and a leakproof design Backwash accessory keeps flow strong Can be used multiple waysSpecs: 20.8""H x 8.6""W Hose Length: 47"" Weight: 8.1 oz."