Give yourself clean and safe water to drink anywhere you go with the Sawyer(R) 32 fl. oz. Water Squeeze(TM) Filter. Take this lightweight and easily collapsible pouch to any lake or river, place the filter on the pouch, and drink from the filter. The filter comes with a simple push/pull cap that makes it very easy to operate. Sawyer's proprietary hollow fiber membrane filters make it impossible for bacteria to get through to you. FEATURES: Portable water filter Extremely lightweight and versatile Weight: 3 oz. Rolls up when not filled to take up very little space in your pack Filter features an easy-to-use push/pull cap Includes one 32 oz. pouch Life expectancy of filter: 1 million gallons Easy to use Fill up the pouch at a lake, river or stream Screw the filter onto the pouch Drink directly from the filter or attach to most threaded water bottles (including 2L bottles) Proprietary hollow fiber membrane filter Certified for ABSOLUTE microns, making it impossible for harmful bacteria to pass through For maximum effectiveness and to extend the life of your filter, Sawyer recommends back flushing after each outing Includes: One lightweight and durable collapsible, reusable pouch Sawyer(R) 0.10 Absolute Micro Hollow Fiber Member Screw On/Off Water Filter Replaceable pop-up drinking spout Cleaning syringe Model: SP129