CamelBak has expanded their line of wearable hydration gear with the new PowderBak vest. Worn as a mid-layer for winter sports, the integrated hydration reservoir lets you ditch your bulky pack and prevent your water from freezing while you play. I have been testing out, over the past few weeks, one of the PowderBak vests that CamelBak sent me and it has quickly become one of my favorite pieces of gear.