TRIED. TRUSTED. TOTALLY IMPROVED. The BlenderBottle Classic revolutionized the industry over a decade ago with its tight seal, iconic design, and the BlenderBall wire whisk. Now, with upgraded features and design, it's still one of the best shakers on the market. Why? Because it works. Features: - ROUNDED BASE SPOUTGUARD LEAK PROOF MEASUREMENT MARKINGS DISHWASHER SAFE BPA FREE 20, 28, 32, and 45-OZ CAPACITY BLENDERBALL WHISK INSIDE Smooth Tastes Good The BlenderBall wire whisk (316 surgical-grade stainless steel)-found only in BlenderBottle brand shaker cups-is the secret behind the Classic shaker's power. Add your ingredients, drop in the BlenderBall whisk, and shake. The BlenderBall whisk whips around inside the bottle, mixing your drinks to a smooth consistency, every time Trust in the Snap The innovative leak-proof lid is engineered to leave worry behind. Just push down on the flip cap until it makes a distinctive snap, then shake or stash the bottle with complete confidence that it is securely closed. When opening the cap, the SpoutGuard protects the drinking surface from grimy gym fingers. An extra-wide carry loop makes it easy to take shakes to go. Smooth to the Last Drop The Classic shaker's rounded base ensures that the BlenderBall wire whisk reaches every last bit of powder-guaranteeing the smoothest possible shake. The bottle also fits most car and gym equipment cup holders.