What's the best filter bottle - if you consider price, weight, maintenance, longevity, etc.? Are they practical for backpacking, where food preparation requires quite a bit of water? Can you recommend a particular bottle? Is it practical to use one to sometimes fill up a Platypus for extra water to carry through a dry area? Are they practical in tiny springs and trickles with no deep pockets?
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"Progress might have been all right once, but it has gone on too long." Ogden Nash