Effortlessly mix protein drinks, pancake batter, sauces, dressings and more by shaking bottle with patented BlenderBall * 28 ounce capacity to the rim of the cup with measurements on the back up to 20 ounces * Stay-open flip cap, GripperBars make it easy to hold * Cup made of BPA-free plasic; BlenderBall made of surgical grade stainless steel * Dishwasher safe; do not use in microwave or with hot or warm liquids