Featuring the Greek letters, Phi Mu Alpha, this 20oz BlenderBottle is made for the gym. Say 'goodbye' to lumpy protein shakes and 'hello' to smooth, great-tasting drinks. BlenderBottles’s patented mixing system uses the BlenderBall® wire whisk—found only in BlenderBottle® brand shaker cups—to mix even the thickest ingredients as you shake. • Patent-pending carrying loop • Ergonomic flip cap and spout • BlenderBall® whisk inside • Leak-proof guarantee • Wide mouth makes it easy to add ingredients • StayOpen™ flip cap won't close on your nose • GripperBars™ make it easy to hold • Embossed ounce and milliliter markings • Fits in most car drink holders • BPA and Phthalate free • NOTE: Bottles hold the specified amount of liquid when filled to the cup brim. For aesthetic reasons, the measurement markings end sooner. For example, the 28-oz. bottle has markings up to 20 oz., even though the full capacity is still 28 oz. • SIZING GUIDE: When in doubt, go a size up. For example, if your shake calls for 16 oz. of liquid plus powder, we recommend using a 28-oz. bottle or larger for best mixing.