Where to Buy
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Here's what other sites are saying:
The SteriPEN Protector Opti water purifier is equipped with an optical water sensor for reliable performance so you can enjoy clean, purified water on the go.
SteriPEN Protector Pack
SteriPEN Adventurer Opti
SteriPEN Adventurer Opti with Solar Charging Case
MSR Guardian Purifier
Platypus Meta Bottle + Microfilter
$25 - $49
Potable Aqua Pure
$100 - $119
MSR SweetWater Purifier System