I used an MSR Hyperflow with no problems (9 oz) for about 900 miles of the AT, but I hear the Sawyer Squeeze is good too (3 oz). It seems to me there would be lots of places where you'd need the hose to extract water from hard to reach places like the Hyperflow has, where the Squeeze would not work at all. Anyone with thru-hike experience with the Squeeze or some other filter lighter than the Hyperflow? Thanks.