Everything else is just a shaker cup. The BlenderBottle Classic revolutionized the industry back in 2004 with its leak-proof seal, iconic design, and the BlenderBall wire whisk. Made from only the highest-quality materials, BlenderBottle brand shaker cups areand always have beenBPA and Phthalate free. The Classic Loops screw-on lid and secure flip cap keep your gym bag and car seat dry. With a snug twist of the lid and the assuring snap of the flip cap, youre ready to roll 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. Our mixing system uses the BlenderBall wire whiskfound only in BlenderBottle brand shaker cupsto mix even the thickest ingredients as you shake. The Blender Bottle Classic revolutionized the industry over a decade ago with its worry-free seal, iconic design, and the Blender Ball wire whisk. Now, years later, it's still one of the top shaker on the market. Why? Because it works.