The UFC Shaker Cup features a patented design with a separate reservoir for your powdered shake. The reservoir screws into the top cover and mouthpiece, forming a seal. With a UFC mixer cup, you fill the cup portion with the liquid of your choice, screw on the lid and you're good to go. Unscrew the colored rim on the lid to mix the powder with the liquid, and shake when you're ready. The lid features a double-click closure so you know it's closed.