"Nathan® Pinnacle 4 Liter Hydration Vest: The Nathan Pinnacle 4 Liter Hydration Vest is a lightweight hydration pack designed for runners tackling long runs and trail adventures who need reliable fluid access without excess weight. Built to fit like a second skin, this unisex vest delivers 4 liters of storage capacity while weighing just 12 ounces with bladder included - making it one of the lightest options available for distance running. The streamlined design keeps the load close to your body, minimizing bounce and distraction as you log miles at any pace.Two 20-ounce HydraPak soft flasks with ExoSpine technology and long hoses with mouthpieces provide easy drinking on the move, while 12 exterior pockets offer smart storage for gels, nutrition, keys, and other essentials. The kangaroo pockets integrate seamlessly into the vest's architecture, giving you quick access to frequently needed items without fumbling. Whether you're running a 50K, training for an ultramarathon, or simply prefer carrying hydration and fuel for extended efforts, the Pinnacle's minimal profile and thoughtful pocket placement keep everything organized and within reach.Why Our Fit Experts Love It""I took the Pinnacle on a long trail run in the heat and appreciated how the vest stayed put even when fully loaded. The soft flasks made hydration effortless, and the weight was barely noticeable as the miles added up."" - Sullivan, Road Runner Sports Fit Expert, Naperville ILWho It's Best ForThe Nathan Pinnacle 4 Liter Hydration Vest is best for runners and trail athletes who log long runs, ultramarathons, and extended training efforts where carrying hydration and nutrition is essential. It works well for anyone seeking a lightweight, minimal-profile hydration pack that won't weigh you down during high-mileage weeks or multi-hour efforts. The unisex design accommodates all body types and running styles. VIP Family members can take the Pinnacle 4 Liter Hydration Vest for a 90-Day test drive with our Perfect Fit Guarantee."