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Ideal for replacing your old, worn-out hydration reservoir, the Nathan 1. 5L Replacement Bladder features BPA-free plastic and a large, easy-fill opening for quickly refilling water at home and trail pit-stops alike. Its high-flow bite valve keeps you hydrated with minimal effort as you blast down your favorite trail or hike up demanding stretches. Moreover, you'll find a quick-release hose for quick cleaning and easy integration with your favorite Nathan hydration pack.