You are allowed to bring hairspray on an aircraft in both your checked bags and your carry-on bags, but both require that you adhere to a few key rules. The majority of travelers are aware that the TSA's 3-1-1 rule prohibits carrying liquids onto aircraft, but questions about can you take hairspray on a plane frequently occur due in part to the spray bottle. The major thing you need to be aware of is the liquid restriction, which stipulates that it must be in a container that is less than 3.4 ounces or 100 ml. Remember that the size of the container matters more than the quantity of hairspray inside.