If you’re traveling on board for the first time you must be wondering how many ounces can you take on a plane . Whether it is in the form of juice, water, soda, wine, etc. there is a fixed amount of liquids in total that you are allowed to carry with you either in your carry-on or checked baggage. TSA 3-1-1 restricts this amount to 3.4ounces for every passenger. It also includes liquids in the form of toothpaste and gels. The only exception to this is medications with prescriptions. You are allowed to take as many liquid medicines as prescribed.