You can mail aerosol cans through USPS, UPS, and FedEx, but every carrier treats them as hazardous materials with rules about which services you can use, how the box must be packed and marked, and what the can itself contains. The most important question is whether your aerosol is flammable, because that single fact narrows almost everything else.
Is Your Aerosol Flammable
Federal regulations place all aerosols in Class 2 (Gases), then split them into Division 2.1 (flammable) or Division 2.2 (non-flammable, non-poisonous).1eCFR. 49 CFR 173.115 – Class 2, Divisions 2.1, 2.2, and 2.3 Definitions Which side of that line your product lands on decides what service you can pick and how much surcharge you’ll pay.
Most household aerosols are flammable. Spray paint, WD-40, cooking spray, and spray starch all fall on the flammable side. Some electronics cleaners and whipped cream dispensers are non-flammable.2Federal Aviation Administration. PackSafe – Aerosols Hairspray and deodorant sprays are almost always flammable because of their alcohol or hydrocarbon propellants. Check the label for a flame symbol, and if you need to be certain, the manufacturer’s Safety Data Sheet lists the exact hazard classification.
Size and Quantity Limits
Nearly all consumer aerosol shipments qualify for “limited quantity” treatment, which relaxes some hazmat requirements while keeping hard caps in place. Each can, metal or plastic, cannot exceed 1 liter (33.8 fluid ounces).3eCFR. 49 CFR 173.306 – Limited Quantities of Compressed Gases A standard can of spray paint at around 12 ounces or a large can of hairspray at 10 to 14 ounces sits well under that limit.
You can put multiple cans in one box, but total package weight cannot exceed 30 kg (66 pounds) gross.3eCFR. 49 CFR 173.306 – Limited Quantities of Compressed Gases USPS goes further for flammable aerosols: total flammable gas across all cans in the package cannot exceed 1 liter, and any plastic containers are capped at 4 fluid ounces each.4Postal Explorer. USPS Packaging Instruction 2A
How to Pack and Mark the Box
All three carriers require a strong outer box with the cans secured so they can’t shift. Use cardboard dividers, foam, or bubble wrap so the cans don’t bang into each other or the walls. Each nozzle needs a protective cap to prevent accidental discharge.3eCFR. 49 CFR 173.306 – Limited Quantities of Compressed Gases
For domestic ground shipments under the limited quantity rules, the outer box must display the limited quantity mark: a diamond (square turned on point) with solid black top and bottom corners and a white or light center. It has to be durable, legible, and clearly visible.5eCFR. 49 CFR 172.315 – Limited Quantities On ground shipments, that diamond is usually the only hazard marking you need. A package showing it is generally exempt from separately displaying the proper shipping name (“Aerosols, flammable”) or the UN identification number (UN1950).6Postal Explorer (USPS). Publication 52 – Hazardous, Restricted, and Perishable Mail Air shipments add marking and paperwork requirements on top of the diamond.
USPS
USPS draws a bright line. Flammable aerosols can travel only by surface, which means USPS Ground Advantage. They are prohibited from Priority Mail and Priority Mail Express because those services move by air. Non-flammable aerosols can go by air, so Priority Mail and Priority Mail Express are both available.6Postal Explorer (USPS). Publication 52 – Hazardous, Restricted, and Perishable Mail
At the counter, postal employees will ask whether your shipment contains anything liquid, fragile, or potentially hazardous. Answer honestly, and bring a Safety Data Sheet if you think the contents might be questioned. For flammable aerosols, the limited quantity surface mark on the box is enough on its own for ground service.6Postal Explorer (USPS). Publication 52 – Hazardous, Restricted, and Perishable Mail
International mail is off the table. USPS bans all Class 2 gases from international shipments, with no exceptions for limited quantities or non-flammable products.6Postal Explorer (USPS). Publication 52 – Hazardous, Restricted, and Perishable Mail
UPS
UPS is the easiest option for a typical consumer shipment. If your aerosols qualify as limited quantities and you’re using UPS Ground within the 48 contiguous states, you don’t need shipping papers, a shipper’s certification, or a hazmat agreement on your UPS account.7UPS. Limited Quantity Exception – Ground Service (49 CFR HM-215K) You still have to classify, pack, label, and mark the box correctly. UPS just skips the administrative layer.
Alaska, Hawaii, and Puerto Rico are a common trap. UPS Ground for hazardous materials, including limited quantities, isn’t available to or from those destinations because part of the trip has to move by air, which disqualifies the ground-only exception.7UPS. Limited Quantity Exception – Ground Service (49 CFR HM-215K)
UPS charges a $58 per-package dangerous goods surcharge for ground shipments. Air-eligible hazmat runs $188 for air-accessible packages and $83 for air-inaccessible packages.8UPS. Revised Rates for Value-Added Services and Other Charges – Domestic Charges (Effective 12/22/2025)
FedEx
FedEx requires approval before you can ship any hazardous material, including limited quantity aerosols. You have to contact a FedEx account executive and go through an authorization process.9FedEx. Hazardous Materials – How to Ship There’s no lighter path for limited quantities the way there is with UPS Ground.
You also can’t drop hazmat off at a retail location. FedEx Office Print and Ship Centers, FedEx Ship Centers, drop boxes, Authorized ShipCenters, and any unstaffed location are all off-limits for hazmat packages, aerosols included. A driver has to pick the package up at your location, so plan to schedule a pickup.10FedEx. Dangerous Goods – How to Ship
FedEx’s domestic dangerous goods surcharges run $185 per package for air-accessible shipments and $85 per package for air-inaccessible shipments.11FedEx. 2026 Changes to FedEx Surcharges and Fees
Aerosols You Can’t Ship at All
Some aerosol contents are banned from every carrier and every service. Federal rules prohibit packaging the following as aerosols:
- Poison gases in Division 2.3, meaning any gas toxic enough to pose an inhalation hazard in transport.
- Highly toxic substances in Division 6.1, Packing Group I or II.
- Severely corrosive materials in Class 8, Packing Group I, which can destroy skin tissue on brief contact.
These bans are absolute regardless of quantity, packaging, or which carrier you pick.1eCFR. 49 CFR 173.115 – Class 2, Divisions 2.1, 2.2, and 2.3 Definitions The product’s Safety Data Sheet will tell you the hazard class and packing group if you need to check.
What Violations Cost
Federal hazmat penalties are steep. Civil penalties can reach $102,348 per violation, or $238,809 per violation when the incident causes death, serious injury, or substantial property destruction, and each day a violation continues counts as a separate offense.12eCFR. Appendix A to Subpart D of Part 107 – Guidelines for Civil Penalties
Criminal penalties apply to knowing or reckless violations. A conviction can carry up to five years in federal prison, or up to ten years if the violation causes a release that results in death or bodily injury.13Office of the Law Revision Counsel. 49 USC 5124 – Criminal Penalty Mislabeling a flammable aerosol to sneak it onto a plane, or failing to declare hazardous contents at the counter, are the sorts of shortcuts that trigger enforcement.