BlenderBottle - BlenderBottle Classic - Clear/Green, 28 oz bottle 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. The dimension on the website is referring to the weight of the item itself and not the capacity of the liquid it can hold. 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