I own one of these Camelbak backpack-style water reservoirs. (Actually, it's a North Face Hammerhead, but it works the same.) Great fit, great straps, great everything.
The only remaining thing is that the adjustable straps always have a bunch of extra length at the ends that I can't seem to tame. I try looping 'em thru the straps themselves or tying them up, but they somehow come loose after long rides.
Anybody have a good solution (bands?) for the flapping extra strap length?