Haven't taken any pictures, which would be needed to provide more details. For the one I described, about $70, but that's guessing because I already had the bag. I have used gravity filters at high altitude (close to 11,000 feet)--no problems. It's just as fast as pumping. It does need a fairly long tube! If it doesn't work, either the tubing is too short or the filter is clogged.

EDIT, LATER: I found the parts list so wrote up instructions in a post on Make Your Own Gear.



Edited by OregonMouse (01/12/12 10:17 PM)
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May your trails be crooked, winding, lonesome, dangerous, leading to the most amazing view--E. Abbey