Quoted By:
I use a REI flash 18 bag. Basically an ultralight gymbag with hiking taken to mind. Two cross body straps, lots of extra loops, pocket for a camelbak, nice and simple. Has loops for attaching to back of bigger bag, or you could smush it inside with no prob. Got mine for 30 bux. Really tho i prefer just water bottle plus fanny pack with poncho, tools, light, etc. For day humps.