28-ounce capacity (note: measurements only go to 22 ounces) classic shaker cup with V2 upgrades, including a rounded base, SpoutGuard, and modern design , Patented mixing system uses 316 surgical-grade stainless steel BlenderBall wire whisk for mixing protein shakes, smoothies, and supplements , Wide mouth makes it easy to add mix scoops and liquids, and embossed markings measure both ounces and milliliters; rounded base for thorough mixing