Can I bring liquid on a plane ? As all of us have many questions about restrictions and how many liquid ounces can you take on a plane . You are allowed to pass the checkpoint with a quart-sized bag containing liquids, aerosols, gels, creams, and pastes in your carry-on bag. These can only be carried in travel-sized containers that weigh no more than 3.4 ounces (100 ml) each. The security procedure is made easier by packing these goods in the compact bag and separating them from your carry-on luggage.