Street-smart hydration system with a super-stable, comfortable sling design delivers liquid when you need it. Secure, three-point harness adjusts to give a secure, sling-style fit. Secure outer pocket fits CD player and other essentials; zippered reservoir access makes loading easy. Efficient, over-the-shoulder tube routing has tube cover that keeps your first sip as cool as the last. Big Bite(TM) valve delivers increased water flow; HydroLock(TM) shuts off flow for leak-proof transport. Flexible 45-fluid-ounce polyurethane reservoir with leakproof, screw-cap closure is easy to fill with water or ice cubes. High-strength nylon exterior with closed-cell insulation keeps cold drinks cool, hot drinks hot.