Featuring a patented BlenderBall wire whisk mixing system, the BlenderBottle Classic is ideal for protein shakes, smoothies, fiber drinks, and meal replacements. A wide mouth makes it easy to add scoops of powdered mixes and liquids while a tightly threaded, screw-on lid creates a leakproof seal and a flip cap snaps securely shut for shaking and transportation. The convenient loop top makes it easy to carry the bottle while on the go.