The NEW Sawyer Squeeze Filter is the lightest and most versatile filtration system on the market. With a total field weight of 3 ounces and ability to roll up, it takes up virtually no space in your pack. This product includes 1 pouch ( 1 L ) that can be reused hundreds of times. Simply fill up the pouch at a lake, stream or river, screw the filter directly onto the pouch and 1) Squeeze the bag and filter water into your water bottle or container of choice, 2) Drink directly from the filter which has a built in push pull cap for on/off functions, 3) Attach the filter onto most threaded water bottles including 2 liter bottles. Kit includes: 1 - Lightweight Durable Collapsible Pouch (1 L), Sawyer 0.10 Absolute Micron Hollow Fiber Membrane Screw On/Off Water Filter, Replaceable Pop Up Drinking Spout, Cleaning Syringe. Life Expectancy: 1 Million Gallons Guaranteed.

 The Sawyer PointONE Biological Filter has a removal rate of 0.10 Micron Absolute, at a 7 log (99.99999%) rate, exceeding EPA and NSF recommendations. 

The Sawyer proprietary hollow fiber membrane filters are small, portable, easy-to-use, reliable, inexpensive, and can last a decade without needing to be replaced.  They are certified for ABSOLUTE microns making itimpossible for harmful bacteria, protozoa, or cysts like E. coli, Giradia, Vibrio cholerae and Salmonella typhi (which cause Cholera and Typhoid) to pass through.  Just drink: no pumping, no chemicals, no waiting, no Worries! Incredibly fast flow rate, simple to use, and each filter can be backwashed to extend its life. We're so confident in our filter technology, most Sawyer Water Filters come with a 1 million gallon guaranteed.

For a thorough review see Sectionhiker.com