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Backpacking Light: How Effective are Backflushing and Storage Practices for Backcountry Squeeze Filters Using Hollow-Fiber Membrane Technology?
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Amazon.com: Sawyer Products SP129 Squeeze Water Filtration System w/Two 32-Oz Squeeze Pouches, Straw, and Hydration Pack Adapter & Coghlan's Backpacker's Trowel : Tools & Home Improvement
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