Our race-ready, bounce-free belt features one 300 ml flask, plus a zippered pocket that fits running essentials and smartphones sized up to iPhone 8 Plus. Specifications Volume: 300ml Features 300 ml flask with Push-Pull Cap for quick access to fluids. Angled holster provides easy one-handed access to hydration Extended side panels hug the body comfortably for a custom fit and bounce-free ride Zip pocket for running essentials