That's easy to do with the Zoid from Sonoma County's own CamelBak. The Zoid's slim design tucks easily beneath multiple layers, insulation keeps up to 70 ounces of water from freezing, and a ...

Camelbak Zoid Hydration Pack – For: anyone — (but particularly the person hoping to break away from the pack because they didn’t stop at aid 1 for a drink.) ...