The BlenderBottle SportMixer Twist Cap Tritan Grip Shaker Bottle fuses form and function to deliver a water bottle that's as versatile as it is stylish. Premium materials and feature-rich design, including an easy-to-open twist cap, make the SportMixer the perfect hydration companion. Featuring a patented mixing systemwith a 316 surgical-grade stainless steel BlenderBall wire whisk (found only in BlenderBottle brand shaker cups) that moves freely inside the bottle to smooth out drink mixes and meal ingredientsits ideal for protein shakes, smoothies, fiber drinks, and meal replacements. Its also a handy kitchen tool for mixing pancake batter, scrambled eggs, and salad dressings. The wide mouth makes it easy to add scoops of powdered mixes, meal ingredients, and liquids. The BlenderBottle SportMixer Twist Cap Tritan Grip Shaker Bottle is made of stain and odor resistant durable Eastman Trian plastic, and features a foldaway loop for portability without bulk, and a firm, feel-good textured grip. Shaker cup can also be used as a water bottle the ball can be left inside, as it will never rust, chip, or peel. Available in two sizes: 20-ounce (note: measurements only go to 17 ounces), and 28-ounce (note: measurements only go to 26 ounces). BPA and phthalate-free, dishwasher safe..