FEATURES: 1. Tested: Meets U.S. EPA drinking water standards* and NSF protocol P231 for removal of bacteria (99.9999%), protozoa (99.9%), and particulates. 2. Pocket-Sized & Light: Like small water bottles, energy chews, mini bike pumps, and tubes, this 142 g (5 oz.) filter disappears in stash pockets. 3. Instant Hydration: Drink directly from the source—without lying in the dirt—and refill your bottles or hydration reservoir with clean water. 4. Quick-Deploy: Zero set-up and simple one-handed operation fills 1-liter bottles in 60 seconds. 5. Simple to Clean: A few shakes helps restore flow rates in the field; no tools required.