Precision Engineered Sportmixer Shaker Cup designed with equal parts style, innovation, and versatility, the Precision Engineered BlenderBottle® SportMixer® rises to the challenge of your active and busy lifestyle, redefining what it means to be a water bottle. Our patented mixing system uses the BlenderBall® wire whisk—found only in BlenderBottle® brand shaker cups—to mix even the thickest ingredients as you shake. The SportLoop™ is surprisingly handy – you’ll wonder how you ever went without it. Made from only the highest-quality materials, BlenderBottle® brand shaker cups are—and always have been—BPA and Phthalate free. Made of durable Eastman Tritan™ plastic, the SportMixer lets you enjoy today's smoothie without tasting last week's protein shake. Workouts and workdays can get mundane, but that doesn't mean your nutrition shakes have to.