Ergonomically designed shaker for smooth lump free shakeswhat is it bottle shaker to mix protein shakeswhy use it mixes protein shakes which would otherwise require blendingwhen to use it everytime you have a protein shakebenefit makes smooth lump free shakes in secondswhat is itthis ergonomically designed leak free shaker bottle has a secure screw top lid with a flip top cap covering a round drinking spout the clear plastic cup has volume markers in both metric and imperial units up