Nathan Trail Mix 4 Plus Hydration Belt Hydration Systems. A Swivi-buckleTM auto-adjusts the belt for a customized fit, while the large storage pouch has room for your running essentials and large smartphones like the iPhone 6 Plus. Features four 10 oz / 300 mL Flasks with Push-Pull caps Ergo-shaped, soft monofilament belt offers multi-directional stretch that eliminates bounce Large zip pocket with key ring clip and front stash pouch for running essentials Fits up to iPhone 6 Plus
