Markings on the front let you to track your fluid intake, and you can mix your favorite drink or electrolytes. This athletic reservoir is BPA-free, odor-free and taste-free, and the easy flow bite valve makes hydrating simple. Recommended Use: Moto Slide lock opening with large opening accommodates ice cubes and easy cleaning after use BPA-free polyurethane film is protected by mPE/EVA technology Hydration Reservoir utilizes radio frequency welded seam technology on seams and exit port to ensure a strong leak-proof bond Angled easy flow bite valve provides a constant flow-rate TPU tubing is odor free and taste free Volume markings on the front for making it easy to mix electrolytes or your favorite drink