My water stays cold to the very last drop even after I left it in a hot car in the sun for 3 hrs. Hose doesn't leak like every other camelbak I've owned has. Pretty comfortable the air channel hype probably only works if your moving, rapidly, like riding a bike or running and the pocket can hold about 2 granola bars and a cell phone which is good enough for me. The bladder isn't a screw top-it's a fold-over with a clip-but it hasn't leaked. That and a detachable hose make the bladder really easy to keep clean. Overall its the best hydro pack out there based just on how well it keeps your water cool.