The WM1 Active is a choose-your-own-system drink belt. The WM1 Active is able to adapt to hold a bladder with tube, a soft flask, an aluminum flask, or a hard flask. With the standard Coxa ergonomic design, it has an adjustable easy-to-use velcro waist band for all your outdoor activity needs. It is light, breathable, and reflective, designed with endurance athletes in mind!