BlenderBottle® ProStak™ System. Featuring the BlenderBall® Wire Whisk and unique Twist 'n Lock containers, the BlenderBottle® ProStak™ is the all-in-one solution for the serious athelete.   | 22 oz. Capacity Cup | 2 fully Independent Jars for Storage | Pill organizer locks into jar lid to save space | Patented BlenderBall® wire whisk included | Quarter turn Twist 'n Lock™ system connects jars to cup | Adjustable Carry Loop | BPA and Phthalate Free | Top Rack Dishwasher Safe | 10 color choices