The World's Smartest Shaker. The SmartShake Difference. Three compartments to store pills, powder & more (E.G. mouth guard, jewelry, keys, oatmeal, nuts or berries). Endorsed by top athletes in a variety of sports. High-quality and BPA free plastic. Leak-proof technology. Patent pending snap-on strainer. Microwave, dishwasher and freezer safe. Mix AND Match - interchangeable parts to make your own customized cup.