Where to Buy
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Here's what other sites are saying:
This ultralight water filter can be used with its pump or used like a straw, removing giardia and amoeba by filtration with no chemicals needed. Taste is not affected.
Platypus GravityWorks Filter System 2L
$100 - $109
$200 - $219
Katadyn Gravity Camp 6L
$72 - $89
Sawyer All in One Filter
Platypus GravityWorks Filter System 4L
MSR Autoflow Gravity Filter
$110 - $119
Katadyn Hiker PRO
$50 - $84