The BlenderBottle Classic revolutionized the shaker cup industry with its leak-proof seal, iconic design, and the BlenderBall wire whisk. Now, years later, it's still the best-selling shaker on the market. Say 'goodbye' to lumpy protein shakes and 'hello' to smooth, great-tasting drinks. The patented BlenderBall wire whiskfound only in BlenderBottle shaker cupswhips around inside the bottle as you shake, delivering unparalleled mixing. Add ingredients like peanut butter, applesauce, or yogurt to your protein powder or meal replacement, and the BlenderBall whisk blends them together with ease. The adjustable carry loop lets you hold more when your hands are full and offers a convenient place to attach keys while at the gym. The screw-on lid and secure flip cap keep your gym bag and car seat dry. Made from only the highest-quality materials, BlenderBottle brand shaker cups areand always have beenBPA and phthalate free.