Though the Katadyn Pocket is not cheap, it's warranted for twenty years and can filter 13,000 gallons of water per filter. Moreover, it weighs less than a pound.

Jeanette Isabelle
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I'm not sure whose twisted idea it was to put hundreds of adolescents in underfunded schools run by people whose dreams were crushed years ago, but I admire the sadism. -- Wednesday Adams, Wednesday