PORTABLE SIZE:The whole capacity up to 4oz if you fill it to the very edge of the jar, but the scale marks on the body show up to 2oz to make sure you can clearly see the capacity from the outside without opening the lid. Perfect Size for packing sauces, salad dressings, peanut butter, jams, dressings, snacks,veg puree,fruits,solid baby foods, mashed avocado, pesto, etc.