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Shown is a Platypus GravityWorks filter, the bottlekit version. The adapter screws right on to the top of my nalgene and also happens to fit my off-brand water bladder. It's a 2L bag and the filter will run 1.5L/minute. Already tried it out one and it works great. Just hang it from a branch or even hold it in the air and you get delicious water. Whole thing weighs a little more than half a pound, too. Anniversary gift from the misses, cost her $100 from REI with free shipping I believe.
I can provide pics of it assembled and hung if anyone wants.
