★★★★★ Sawyer Products SP131 PointOne Squeeze Water Filter System with 3 Pouches – Amazon review
Climbed Mt Rainier with this thing. You have to melt the snow, but you have to melt snow anyway with other filters. (and it saves on fuel since you just have to melt it to the melting point and not let it boil for 3-5 minutes, which consumes fuel fast.
Love this thing!
Original review from Beau Chevassus, Knok Studio (Media for non-profits), http://www.knok.org (Seattle nonprofit) Knok.org
From Beau Chevassus: http://smile.amazon.com/gp/profile/A1IJUCICSBF7LA