Patented BlenderBall wire whisk whips around the bottle when you shake creating smooth, great- tasting drinks. No more mesh grates and plastic gimmicks!, 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., Gripper bars on the side make the bottle easy to hold., Back of bottle indicates ounce and millimeter markings so you can pour just the right amount., 100% Leak proof. Our 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, you’re ready to roll., Wide bottle opening makes pouring ingredients and cleaning very easy., Made from only the highest-quality materials, Blender Bottle brand shaker cups are—and always have been—BPA and Phthalate free so it won’t leak harmful chemicals into your drink.