Camelbak Women's PowderBak Hydration Pack Wearable Hydration with a 72 oz low profile reservoir integrated into a full zip mid-layer vest. Hydropouch reservoir compartment insulates and stabilizes your water while enhancing it's freeze resistance. A great way to stay hydrated while Skiing, Snowboarding, X-Country Skiing and Snow Shoeing. Lightweight and breathable QUICKWICK fabric delivers moisture management and dries quickly for cool and comfortable performance. QUICKFIT fabric provides compression and self adjusts to comfortably hold and stabilize 72 oz of water while conforming to the body.