The Salomon Park Hydro Handset features a 16 oz (500mL) soft flask that collapses as you drink to prevent liquid from sloshing and a unique hand strap that allows your hand to stay relaxed. The soft mesh hand strap can be worn on your left or right hand, and in several different ways so you always find a comfortable position. A mesh zipper pocket is big enough to fit an iPhone, keys and gels, while a small open mesh pocket fits a single energy gel, ID or key. Reflective details increase visibility in low-light conditions. Material: Polyester, Mesh.