"Going to the woods is going home, for I suppose we came from the woods originally." ~John Muir

Gravity Filter from Katadyn Hiker Filter and Walmart Dry Bag

I usually use chemicals or just don't treat, but I started looking at filters b/c my wife doesn't like chemicals, and filters eliminate the wait time. But I didn't want to pump so I looked at ways to make a gravity fitler. First I got a Sawyer inline filter from a water bottle at Walmart and hooked it up to my Nalgene soft-sided canteens. It worked, but the flow rate was very slow. I wanted a bigger filter to improve the flow rate, and I remembered seeing this BackpackingLight thread where they made a gravity filter like the 7.5 oz ULA Amigo Pro.

I used the Katadyn Hiker filter, the bottle neck and cap from a flexible Nalgene bottle (NOT the soft-sided canteen), and the 8L bag from the Walmart DryBag 3-pack. The SmarTube will allow me to screw the tubing right onto a water bottle, then just disconnect the tube from the filter and drink from it.

Final weight is 5-1/8 oz (144 g), not including the tubing because I'd carry that anyway. I could probably scrape another fraction of an ounce from the filter, and changing the bag to cuben fiber would save a bit as well.

Discuss This Project Here.