Nathan Trail Mix Plus Hydration Belt 3.0MORE SECURE WITH LESS BOUNCE Updated holster design that provides easy, one handed, on the fly access to hydration and nutrition with no bounce. EXPANDED POCKETS New large expandable front zippered pocket designed to fit most large smartphones. Belt offers multi directional limited stretch that contours body and eliminates bounce Updated holster design that provides easy, one handed, on the fly access to hydration and nutrition Two 10oz 300 mL flasks