What Our Gearhead(R) Experts Are Saying:"I brought the 3-in-1 Filtration Kit on a week-long backcountry trip where water sources were plentiful but reliability was not, and it handled every situation I threw at it. In camp I hung the gravity bag while I set up my shelter, and on the move I used the squeeze bottle, so I never once had to slow down just to get safe water."Water is never the thing you want to be thinking about when you are deep in the backcountry, and the LifeStraw 3-in-1 Filtration Kit is built to keep it that way. This modular system works as a straw, a squeeze bottle, and a gravity filter interchangeably, so whether you are drinking directly from a stream, filling a bottle on the move, or filtering a large batch in camp, one kit covers every situation without redundancy or extra weight. The membrane microfilter at the heart of the system eliminates 99. 999999% of bacteria, 99. 999% of parasites, and 99. 999% of microplastics through a 0. 2 micron pore size, with a cartridge life of up to 500 gallons. The 3L gravity bag handles high-volume filtering hands-free in camp while the 650mL collapsible squeeze bottle keeps hydration moving on the trail. A backwash syringe and field-cleanable design mean the filter stays functional deep into the miles, and every purchase sends a child in need safe water for an entire year.