Can You Bring Aerosol Cans On A Plane?

The Quick Answer

You can bring aerosol cans on a plane, but the rules depend on three things: what's in the can, how big it is, and whether it's going in your carry-on or checked bag. Toiletry aerosols like hairspray and deodorant are fine with size limits. Industrial or flammable aerosols like spray paint are banned outright.

Here's exactly what you need to know.

Aerosols In Carry-On Bags

Aerosol cans in your carry-on follow the same 3-1-1 rule as liquids and gels:

• 3.4 ounces (100ml) or smaller per container
• Must fit in your quart-sized clear bag with all your other liquids and gels
• One quart bag per passenger

This applies to personal care aerosols only — things like:

• Deodorant / antiperspirant spray
• Hairspray
• Dry shampoo
• Shaving cream / foam
• Sunscreen spray
• Body spray / perfume
• Insect repellent

The catch? Most standard aerosol cans are way bigger than 3.4 oz. A typical can of hairspray is 7-11 oz. A normal deodorant spray is 3.8-5.3 oz. You'll almost always need to buy travel-sized versions specifically for carry-on.

Aerosols In Checked Bags

Checked bags give you much more room, but there are still limits:

• Each can: up to 18 oz (500ml) — this covers virtually every consumer-sized aerosol product
• Total per passenger: 70 oz (2 liters) — combined total of all aerosol cans in your checked luggage
• Cap must be on. Every aerosol in checked luggage must have its protective cap or cover secured to prevent accidental discharge. If your can doesn't have a cap, it technically shouldn't go in checked bags.

These limits are set by the FAA, not TSA, because it's a hazardous materials regulation. The concern is that a leaking or accidentally triggered aerosol in the unpressurized cargo hold could create a fire risk or fill the space with fumes.

Aerosols That Are Completely Banned

Not all aerosols are created equal. Some are prohibited in both carry-on and checked luggage because they're classified as hazardous materials:

• Spray paint — flammable
• Cooking spray (PAM, etc.) — flammable
• WD-40 and similar lubricants — flammable
• Spray starch — flammable propellant
• Industrial cleaners — hazardous chemicals
• Pepper spray / mace — one small container (max 4 oz) is allowed in checked bags only, but never in carry-on
• Bear spray — banned from both carry-on and checked bags entirely
• Spray adhesives — flammable
• Aerosol tire inflator — varies by product; nonflammable ones are allowed

The general rule: if it's a toiletry or personal care product, it's probably fine. If it's anything else, check the TSA or FAA website for your specific product before packing.

How to Tell If Your Aerosol Is Allowed

Look at the can itself. Most aerosols have hazard warnings printed on them:

• "Flammable" or a flame symbol — If it's a toiletry (deodorant, hairspray), it's still allowed under the personal care exception. If it's not a toiletry (spray paint, cooking spray), it's banned.
• "Nonflammable" or no hazard symbol — Generally allowed in both carry-on (with size limits) and checked bags.
• "Corrosive," "Toxic," or "Poison" symbols — Banned from both carry-on and checked bags.

The FAA classifies aerosols by their DOT hazard class. Toiletry aerosols get a special exemption even though many of them contain flammable propellants (butane, propane). That exemption doesn't extend to non-toiletry products.

Medical Aerosols: Special Rules

Prescription and over-the-counter medical aerosols get extra leniency:

• Asthma inhalers — allowed in carry-on, no size restriction, don't need to go in the quart bag
• Nitroglycerin spray — allowed in carry-on
• Prescription aerosol medications — allowed in reasonable quantities for your trip

You should declare medical aerosols at the security checkpoint. You don't need to put them in your quart-sized bag — they're exempt from the 3-1-1 rule. Having a prescription label or doctor's note can speed things up, but it's not strictly required for common medications like inhalers.

Common Aerosol Scenarios

Dry Shampoo

Travel size (under 3.4 oz) in carry-on, full size in checked. Dry shampoo aerosol cans are one of the most commonly confiscated items at security because people forget they count as aerosols. The standard Batiste can is 6.73 oz — too big for carry-on.

Sunscreen Spray

Same rules as other toiletry aerosols. Travel size for carry-on, full size for checked. Banana Boat and Coppertone both make travel cans around 1-3 oz that are carry-on compliant.

Body Spray / Cologne

Axe, Bath & Body Works sprays, and similar products follow the standard 3.4 oz carry-on limit. Most full-size body sprays are 3.5-8 oz, which means you'll need the travel version for carry-on.

Spray Deodorant

Travel-sized spray deodorant (usually around 1 oz) works for carry-on. Full-size cans (typically 3.8-5.3 oz) go in checked bags. If you want to avoid the hassle entirely, switch to a solid or roll-on deodorant for travel — they still count toward your quart bag but take up less space.

Packing Tips for Aerosols

• Keep caps on, always. In checked bags, it's required. In carry-on, it's just smart — you don't want an aerosol going off inside your quart bag.
• Put checked bag aerosols in a zip-lock. Pressure changes at altitude can cause slow leaks. A sealed bag contains the mess.
• Don't overpack the quart bag. Aerosol cans are bulky and round, taking up more space than flat bottles. If you're bringing an aerosol in carry-on, plan your quart bag around it.
• Consider non-aerosol alternatives. Solid deodorant instead of spray. Pump hairspray instead of aerosol. Lotion sunscreen instead of spray. You'll save quart bag space and avoid the rules entirely.
• Temperature matters. Don't leave aerosol cans in hot cars or direct sunlight before your flight. Excessive heat + pressurized can = potential rupture.

International Flights

The 100ml carry-on limit for aerosols is an international standard followed by virtually every country. You'll face the same restriction whether you're going through security in London, Tokyo, Sydney, or Sao Paulo.

Checked bag rules are also broadly similar worldwide, based on IATA (International Air Transport Association) guidelines. However, some airlines — especially budget carriers in Asia and Europe — have stricter limits or additional restrictions. Always check your airline's specific prohibited items list for international flights.

What Happens If TSA Finds a Banned Aerosol?

If you accidentally pack a banned aerosol (like cooking spray) or an oversized toiletry aerosol in your carry-on, TSA will ask you to surrender it. You can either throw it away at the checkpoint or, if time allows, take it back to the check-in counter to put in your checked bag.

There's no fine or penalty for an honest mistake. TSA agents deal with aerosol issues dozens of times per shift. They'll toss the can and send you on your way.

If you try to bring something genuinely dangerous — like an industrial-sized can of something toxic — that's a different conversation, but normal consumer products just get confiscated.