I used my new Camelback Lobo for the first time today. It worked awesome. Forget bottles. I don't like stopping on a ride so the camelback is much easier to use than trying to hold a bottle in one hand and keeping control of the bike with the other hand when going over bumpy trails. Just the right amount of storage capacity for me.

Camelback Lobo
100 oz. (2 liter) capacity. I went through 60 oz on a 1 hour ride with outside temp @ 75 deg.
Cargo volume: 200 cubic inches.
Comfortable harness.
Great airflow through the backpanel
Nice quick access pocket on the front of the harness for a gel packet.
Removable water reservoir for easy cleaning.
The bite valve worked very well.
No leaks.

Everything about this pack seems perfect for a 1-3 hour ride. I would probable carry a water bottle for a 2 hour ride on a hot day, (90+ degrees).