The Adventurer Opti is extremely efficient, with a design that purifies a half-liter of water in 48 seconds and 1 liter in just 90 seconds. Plus, the optical sensor can double as a convenient LED flashlight. Activated by pressing and holding the single button down for three seconds, the flashlight makes a great backup light when camping or taking a nighttime walk to refill your water bottle. Bundled with two disposable CR123 batteries and a neoprene case with a belt loop, the Adventurer Opti works with containers with a minimum 1.75-inch diameter opening, including Nalgene wide-mouth bottles.
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