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.
Where to Buy
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SteriPEN Classic 3 UV Water Purifier
$70 - $79
SteriPEN Ultra UV Water Purifier
$100 - $109
MSR Guardian Purifier
SteriPEN Adventurer Opti
$90 - $99
Platypus Meta Bottle + Microfilter