The bag itself is GREAT. I bought it to hit Cannel Plunge here in southern california. Knowing it was going to be a 5+ hour ride down a mountain, I needed more space. The bag worked out perfectly for that.
Zero complaints about the bag, it's spacious, comfortable and appropriately utilitarian.
The bladder on the other hand leaks at the mouthpiece. So my left leg is getting dripped on while I ride (and wasting my liquids!). I suspect it's something in the mouthpiece itself since when I drink out of it I'm getting air/bubbles... but I can see the tube and there is no air/bubbles in it. Annoying.
[EDIT] I emailed Dakine customer service about this, and the next day they emailed me back, apologized and mailed me a new bite valve. No questions, no fuss, no charge. That's good service my friends. They're backin their stuff up!