SportMixer has a StayOpen™ Flip Cap for easy carrying, large drink/pour spout, ounce and milliliter markings for easy measuring, a 316 surgical-grade stainless steel Blender Ball wire whisk that mixes as you shake, rubberized overmolding for a no-slip grip, secure screw-on lid, and is made with Eastman Tritan™ BPA-free material that's dishwasher safe.