The ultimate all-in-one shaker cup. Leak-proof, expandable and unbelievably powerful, the BlenderBottle® Prostak™ does it all. The patented BlenderBall® wire whisk delivers smooth shakes every time, while the unique Twist n’ Lock™ jars offer unlimited storage. Convenient loop, stay open flip cap, large drink/pour spout, wide mouth opening, secure screw-on lid, embossed ounce and milliliter markings. Great to carry your protein powders, vitamins & pills, supplements, creatine & much, much more. Dishwasher safe, BPA-free.