Osprey Zealot 16 Hydration Pack
The Zealot 13 is the right thing to pull out of the closet when you know it's going to be a long day descending, riding lifts, or big shuttles. Unique features include a 40mm straight ErgoPull hipbelt with zippered pockets and easy access to a roll-out tool pouch which can easily hold all your spare parts and tools.
I had a Raptor before this. Even though this bad is pushed toward the free ride set. I bought it for the features and color. The bag feels great on my back, and I hardly feel it for x-country riding. Definitely don't feel the heft of the bag. Best I ever had. Only bag I own now