The new and improved Classic shaker gives our tried and true bottle an impressive overhaul with performance-focused innovation and modern style. Say goodbye to lumpy protein shakes. Our powerful mixing system uses the BlenderBall wire whiskfound only in BlenderBottle brand shakersto deliver smooth protein and nutrition shakes with ease. The Classic shaker sports an updated lid featuring a more ergonomic carry loop and SpoutGuard to keep dirty gym fingers off the drinking surface. Forgot to add liquid first? No sweat. The rounded base allows the BlenderBall whisk to mix every last bit of powder. Integrated with the StayOpen flip cap, 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.