Have not evaluated hydration system. Bought for the bag. Light, tough, very well laid out, great conformal side pockets, rides high, top-loads, straps are modular (hip belt dismounts, and main straps have fastex disconnects). Only complaint I have is it should be about 10-15% larger. They quality of they suspension system would easily handle a bigger, heavier load making it a good 3-day bag.
Pros: Construction, ride, weight, durability, layout
Cons: none yet
This review was written in the old system and had content requirements that are different than reviews written today.