This thing is THE BEST!!! Took it backpacking at +10,000ft. and WOW! Water tasted better there than from my in-home purifier! Even dipped it right into still lake water right on the shore. Never got sick or anything! Just pure, mountain fresh glacial water (pre-chilled too;). So if you plan on doing any high/low-altitude backpacking or hiking (or just want a reliable backup water source for your next adventure), this is a MUST HAVE for your checklist of MUST HAVE's. Simply put-don't leave home without it!
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