LifeStraw Mission Water Purification System, 12 liter $74.99
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Amazon has the LifeStraw Mission Water Purification System, High-Volume Gravity-Fed Purifier for Camping and Emergency Preparedness, 12 Liter. Best price ever per the camels. For comparison, Amazon has the 5 liter for $76 and REI has the 5 liter for $120; Lifestraw website has the 12L for around $125.