LifeStraw Go

Drink directly from a stream or lake with the straw, or fill up the bottle if you're on the go. This filter uses advanced hollow fiber membrane technology to filter up to 1,000 liters of water to 0.2 microns. Removes 99.9999% of waterborne bacteria. Weighs 5.9 ounces.

Buy it at buylifestraw.com

$34.95