The phd nutrition shaker is a 750ml shaker designed to provide you with a lump free protein shake when yoursquore on the go phd shaker cup features a screw on leak proof lid while the flip cap stays in place allowing the drink to be taken straight from the bottle the phd shaker is also easy to clean as it doesnrsquot use a mixing mesh and is dishwasher safe instead the phd drink shaker features a lsquomixer ballrsquo that works on the same principle as a wire whisk this s