Determining where to pack hairspray depends entirely on the size of the container and current aviation security regulations. If you wish to bring hairspray in your carry-on luggage, it must comply with the 3-1-1 liquids rule: the container must be 3.4 ounces (100ml) or smaller, and it must fit inside a single quart-sized, clear plastic bag. Most standard-sized hairsprays exceed this limit and must be packed in your checked luggage. However, there are safety restrictions for checked bags as well: the FAA and international civil aviation rules classify hairspray as a "medicinal or toiletry" aerosol. In checked baggage, the total capacity of all such aerosols must not exceed 2 kg (70 oz) or 2 L (68 fl oz) per person, and each individual container cannot exceed 0.5 kg (18 oz) or 500 ml (17 fl oz). It is also vital to ensure the nozzle has a protective cap to prevent accidental discharge due to pressure changes or shifting luggage during the flight.