Here's what other sites are saying:
Let gravity do the work with the Lifestraw Flex with Gravity Bag water filter. Hung from a tree or stashed in your pack, it provides easy access to clean water so you can focus on your adventure.
Where to Buy
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LifeStraw Mission Gravity Water Purifier
$120 - $144
Platypus GravityWorks Filter System 2L
$90 - $109
$165 - $219
Katadyn Gravity Camp 6L
$76 - $89
Katadyn Gravity BeFree 3.0L
$55 - $69
Platypus GravityWorks Filter System 4L
$110 - $119