The LifeStraw Flex is a two-stage water filter built around a hollow-fiber membrane plus a carbon capsule. It works four ways: as a personal straw, screwed onto a plastic bottle, inline with a hydration bladder, or hanging from the included one-gallon gravity bag for group use. The carbon stage cuts chlorine, taste and odor, which most straw-only filters skip. It suits campers, hikers and travelers who want one filter for solo sips and shared water at camp; it is not a pump and does not remove dissolved salts or viruses.
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Owners treat the Flex as a versatile, dependable filter for camping and travel. They like the gravity bag for making a batch of water and the carbon stage for better taste. Complaints center on slowing flow as the filter loads up and on the carbon capsule wearing out sooner than the main filter.
The LifeStraw Flex with Gravity Bag is a 2-stage water filter that provides safe drinking water in any environment. It comes with a one-gallon gravity bag.
The filter can be used in 4 ways: with the included gravity bag, as a personal straw, attached to a plastic water bottle, or with a hydration bladder.
