How much liquid can I bring on my flight? Are you eager to know how many liquid ounces can you take on a plane ? The contents of the try to mess, secure bags have to be checked and authorized. You are not allowed to bring anything that sends off an alert or that cannot be checked on board with you. Although if they are contained in a safe, tamper-evident package, we recommend packing all liquids, gels, and sprays larger than 3.4 ounces or 100 ml in your checked luggage. Alcohol in carry-on must fit easily in a single quart-sized bag in the form of little bottles.