Sunflower 24hr - recommend me some gear

[Sandwich]

I'm doing a 24hr adventure race in kansas come late march, and I'm getting my gear together. I'm going to get a new hydration pack and use that to lug all my stuff around. Anybody have any suggestions on size and brand? Northface makes a nice "big mouth" pack, but is that too big? Anybody with any dakine experience? Their stuff is a little more MTB oriented, but will it do ok on an extended run?

[splat]

what all is this race going to Entail , ? Besides running and Mt Biking ?

[Sandwich]

kayaking and climbing, from what I understand.

[TreeSaw]

Sounds like a cool event! I have had excellent luck with my Hydrapaks. I have a few different sizes and they are roomy and carry plenty of gear & water for me. I have a really short torso and they fit me comfortably as well!