DolfinPack Lightweight, Form-Fitting, Waterproof, Extreme Sports Hydration Pack Awards: Winner of the hydration anywhere "best running hydration pack". Featured in SUP magazine as a top hydration pack of 2015. Lightweight, minimalistic hydration pack for extreme sports and on the go hydration. Perfect for marathons, stand-up Paddle boarding, biking, surfing, hunting, snowboarding, skiing & other extreme sports. BPA free 1.5L reservoir with high flow bite valve & neoprene hose cover for insulation. Neoprene wrapped elastic straps for superior comfort, no chafing, and the tightest most comfortable fit guaranteed.