18 oz/535 ml Speed Draw Flask with push/pull Race Cap, Expandable zippered stretch pocket keeps essentials protected.Angled insulated bottle holder on running waist pack allows easy one handed access, Easy to store and easy to release from belt – stays in place throughout run!  Extended side panels hug the body comfortably for a perfect fit, Bottle and storage areas are securely fastened to ensure your essentials are protected.Reflective detail and trim helps you be seen in dim light, without sacrificing a sleek aesthetically pleasing design. Eliminate the need for a larger running hydration pack – Simplistic and functional.