Hip Pack + Double Bottle Base

Good option besides a large backpack

Great Fit

Great fit; feels much less cumbersome than a backpack.

Almost great.

Idea is sound. Storage is good. Bottle mechanism is great. Only flaw, and it's a big one, is that it slides down your back very easy and ends up too low. It gets in the way of sitting back on your saddle. No amount of tightening helped.