There might be a question about how many liquid ounces can you take on a plane ? Is this authorized to carry liquids in aircraft ? so don’t worry . If you are only taking carry-on luggage, it is okay if your hygiene bag is a little bit bigger. Although conforming to the liquids' maximum size restrictions is a smart option To protect travelers, the Transportation Security Administration, or TSA, forbids several substances from being brought onto aircraft. These things might not be allowed under the rules, even if you abide by the 3-1-1 rule. TSA prohibits the transport of any potentially dangerous liquids for the safety of the crew as well.