The Nathan Trail Mix Plus 3.1 running belt is perfect for carrying your hydration, nutrition and essentials with you during your runs, walks and hikes. Nathan updated the holster design of the belt to provide easy, one-handed access to your hydration with less bounce. The belt contains two 10 oz flasks with Push-Pull Blast Valve™ caps to give you plenty of hydration during your workouts.Lock some energy gels in the two shock cords along the side, throw your phone and other small essentials in the large expandable front zippered pocket and hit the trail with the Nathan Trail Mix Plus 3.1. Details: Belt offers multi-directional limited stretch that contours the body and eliminates bounce Updated holster design provides easy, one-handed, on-the-fly access to hydration and nutrition Two 10 oz / 300 mL flasks with Push-Pull Blast Valve™ caps New large expandable front zippered pocket designed to fit most phones Exterior mesh pocket for easy fast storage Two shock cords with one-pull tension lock at sides for extra capacity Elastic keepers neatly hold excess straps Printed Reflective logo offers 360-degree reflectivity for added visibility in low-light conditions