KC, what extra parts did you get so that you can use it as a gravity filter?
Smoke:
I got one of these adapters and three feet of surgical tubing. It's easy.
http://sawyer.com/products/sawyer-inline-hydration-pack-adapters/ I also used a one-hole paper punch to put a couple of holes in the margin at the end of the bag so I could hang the bag with a piece of chord.
KC