A 2/3 measuring cup is equal to about 5¼ oz or About 11 Tbs. It can hold a quality of around 167 ml. It can measure any liquid or even powders like sugar or flour. If you do not get this size in the market, you can use a 1/3 cup twice—measuring cups in various sizes. Dry cups have flattened tops and come in sets with common measurements like ¼ cup, ½ cup, ¾ cup and 1 cup. Liquid cups have marks on them to determine the amount of liquid. You can choose from many brands like Pyrex, Home depot, All-clad, Wilton, Farberware, Kitchenaid, Le Creuset, and more.