Where to Buy
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Here's what other sites are saying:
Made in the United States and originally designed for the military, the SteriPEN Defender ultraviolet purifier is your single source for potable water when you're traveling and backpacking.
SteriPEN Aqua Water Purifier
MSR Guardian Purifier
$349 - $350
SteriPEN Adventurer Opti
Potable Aqua Pure
$100 - $119
Platypus Meta Bottle + Microfilter
$25 - $49
MSR SweetWater Purifier System
$80 - $99
SteriPEN Classic 3 with Pre-Filter