CamelBak's RaceBak is a revolution in lightweight wearable hydration. This quick-drying, breathable baselayer hides an innovative 70-ounce reservoir on your back and under your jersey for aerodynamics and ease of use. It's sleeveless, has a full-length zipper, and uses flatlock seams for forget-about-it comfort. Your water stays cool thanks to the removable, insulated back panel and hose cover, and the Hydropouch reservoir compartment stabilizes and supports the water on your back. Athletes rejoice — the next generation of hydration is here.