Weighing less than that PB&J you packed for your hike, the Sawyer Mini Water Filter is the lightest, most versatile filter currently available. . Multifunctional filter unit weighs a mere 2 ounces and fits right in the palm of your hand. Use the Mini filter to drink directly, or attach it to your Sawyer Squeeze Pouch. Filter will also attach directly to most threaded water bottles, including 2L bottles. Can be used as an inline filtration system for your hydration pack. 0.10 Micron Absolute hollow fiber membrane water filter safely and effectively removes bacteria and protozoa such as E. coli, Giardia, Vibrio cholerae, and Salmonella typhi. Removal rate of 99.9999% exceeds EPA and NSF recommendations to deliver reliably potable water. Guaranteed to last for 1,000,000 gallons.