are aerosols allowed on planes? When it comes to bringing aerosols in carry-on luggage, there is a size limit of 3.4 ounces or 100 milliliters per item. All aerosols should be packed in a clear, sealable plastic bag, and the total volume of all items in the bag should not go over one quart (or one liter). This bag will be checked by TSA during the security check at the airport.