If you accidentally pack a can of “full-size” hairspray, the TSA will find it. Their X-ray machines treat aerosols like shiny, suspicious eggs. They’ll pull your bag, pull you aside, and you’ll perform an awkwardly polite dance where you say “Oh no, I forgot that was in there” and they say “Well, you can surrender it or check the whole bag.”
Spray Cans On Flights
Here’s a joyful tip: If you forget to take it out and it’s over 3.4 ounces, just surrender it with dignity. Watch it join a sad collection of travel-sized dreams. One time, I watched a guy give up a can of spray cheese and the TSA agent cracked a smile. It was the most wholesome part of my flight.
What about checked baggage?
Checked bags are a free-for-all for aerosols—sort of. You can pack larger cans, but they must be non-flammable or have limited flammable potential. Most hairsprays, deodorants, and shaving creams are fine in checked luggage. But if you’re trying to pack a can of spray paint, you’re basically begging for a delay.
Also, pro-tip for checked bags: Wrap your aerosol cans in a sock or soft cloth so they don’t get punctured by your water bottle or your attempt to smuggle a souvenir sword. Nothing ruins a vacation like a suitcase that smelled like a chemical explosion.
