The Sawyer MINI Filter is a small filter for backpacking, travel and anywhere you need safer drinking water. It's called the MINI for a reason, because you can tuck it into your pack, hold it in your hand or stuff it in your pocket and take it anywhere. It's small and ready to use whenever you need a drink. Attach it to the included pouch and drink from there. Or maybe you have a hydration reservoir, then you can link it inline to the hose.