An all-in-one protein shaker and storage system for serious athletes. The BlenderBottle ProStak shaker combines a durable, leak-proof shaker bottle with interlocking storage containers, making it easier than ever to carry nutrition and supplements on the go. The bottle boasts an updated ProSeries lid, featuring a SpoutGuard to keep germs from the drinking surface, a secure flip cap, and a wide carry loop for easy portability. The powerful mixing system utilizes the BlenderBall wire whisk—found only in BlenderBottle brand shakers—to mix even the thickest ingredients for smoothies, protein shakes, and meal replacements.