The LifeStraw Mission high-capacity, gravity water filter system purifiers water to 0.02 microns. The water purifier makes contaminated water safe to drink by removing 99.999% of viruses, 99.999999% of bacteria, 99.999% of parasites and 99.999% of microplastics. Ideal for group camping, outdoor expeditions, adventure travel and use in emergencies, the LifeStraw Mission can provide up to 4,755 gallons (18,000 liters) of safe water. Easy to fill in lakes, rivers and streams, the system includes a compact roll-bag available in 5- and 12-liter sizes. Your purchase has impact. For every LifeStraw product purchased, a school child in need receives safe water for an entire school year. TOP FEATURES- High performance purifier removes 99.999% of viruses (including Rotavirus, Hepatitis A), 99.999999% of bacteria (including E. coli, Salmonella), 99.999% of parasites (including Giardia, Cryptosporidium), 99.999% of microplastics and turbidity (silt, sand, cloudiness) - Filters up to 3.1 gallons (12 L) per hour, perfect for groups, camping, emergency preparedness and survival - Convenient roll-bag and shoulder strap for easy transport and flexibility to hang virtually anywhere; built-in backwashing system - The long-lasting microbiological purifier provides up to 4,755 gallons (18,000 liters) of safe water - This product gives back: one purchase, one child, one year of safe water  SPECIFICATIONS- Membrane ultrafilter purifies water and removes 99.999% of viruses, 99.999999% of bacteria, 99.999% of parasites, 99.999% of microplastics and turbidity (silt, sand, and cloudiness), 0.02 micron pore size - Meets NSF/ANSI P231 standard for reduction of viruses, bacteria and parasites - Membrane ultrafilter lasts up to 4,755 gal | 18,000 L - Weight: 1.17 lbs | 0.53 kg - 12L hose length: 27.6 in | 70 cm - 12L bag size: 23.8 x 6.7 in | 60.5 x 17 cm - Filter size: 12.6 in | 320 mm - Max flow rate: 3.1 gal/hr | 12 L/hr - Food grade materials (US FDA 21 CFR standards) - BPA-free - Bag is made of durable, TPU laminated nylon - Replaceable filter & parts - Includes: 12-liter gravity bag with quick-connect hose, water purification cartridge and built-in backwashing system