Can You Take Aerosols on a Plane? Carry-On & Checked Rules

If you’ve flown out of Dublin recently, you might have noticed something different at security — the 100ml liquid limit is gone. But here’s what many travellers don’t realise: that relaxed rule applies only at the airport. Ryanair still enforces the strict EU-wide cap of 100ml on all aerosols and liquids in your carry-on, regardless of what Dublin’s new scanners allow.

Max container size: 2 litres ·
Old limit abolished: 100ml rule gone ·
EU security rules: Apply to aerosols ·
Carry-on permitted: Most personal aerosols ·
Checked baggage option: Full size allowed

The table below summarises the key rule differences between Dublin Airport and Ryanair.

Can you take aerosol cans in your luggage on a plane?

The short answer is yes — but the details depend entirely on which airport you’re departing from and which airline you’re flying with. Aerosols are classified as liquids under EU security regulations, and that classification shapes every rule that follows. Dublin Airport has liberalised its screening process significantly, while Ryanair maintains the standard EU maximum for all passengers boarding its aircraft.

Carry-on rules

At Dublin Airport, passengers can now bring liquids and aerosols in containers up to 2 litres through security — no clear bag required, no 100ml squeeze. This change came courtesy of new scanning kiosks installed at the terminal. However, this applies to the airport security checkpoint only. Once you board your Ryanair flight, the airline’s own conditions of carriage take over, and those conditions mandate the EU-wide 100ml ceiling on all liquids and aerosols in the cabin. The implication: you can walk through Dublin security with a full-size hairspray, but you’ll still need to stow any aerosols larger than 100ml in your checked luggage before boarding.

Checked baggage rules

Checked baggage offers the most freedom for aerosol travellers. Full-size cans of hairspray, deodorant, and dry shampoo are permitted in the hold on both Ryanair and Aer Lingus flights. The main restriction here is that the aerosol must not be classified as dangerous goods — flammable sprays, pepper spray, and tear gas are banned in both carry-on and checked baggage. Ryanair specifies that oversized cabin bags may be placed in the hold for a fee of €70 plus VAT on domestic routes.

Which aerosols are not allowed on planes?

Not every aerosol qualifies as a harmless toiletries item. Safety regulations draw a firm line around anything classified as a weapon, incapacitating agent, or fire hazard. These prohibitions apply regardless of container size, airport, or airline.

Prohibited types

The following aerosol categories are banned from both carry-on and checked baggage on Ryanair flights: pepper spray, tear gas, animal repellent spray, and any other incapacitating chemical spray. Firearms, stun guns, and explosives round out the list of items that cannot travel in any part of your luggage.

Flammable restrictions

Aerosols with flammable propellants face the strictest limits. Even in checked baggage, canisters carrying butane, propane, or other highly flammable gases are typically prohibited unless explicitly labelled as “consumer commodities” and meet specific packaging standards. The safest approach for passengers is to assume that any aerosol with a flammable warning label belongs in the bin, not the suitcase. The pattern here is consistent across all EU carriers: when in doubt, leave it out.

Can I put aerosol deodorant in my carry-on?

Yes, in principle — but the volume matters if you’re boarding a Ryanair aircraft. Personal toiletries including aerosol deodorant are permitted in carry-on baggage, subject to the 100ml container limit per item and the total 1-litre bag capacity enforced by EU security requirements. A standard deodorant can is often 150ml or larger, which means it exceeds the Ryanair threshold even if Dublin’s scanners would let it through. Small travel-size deodorants of 100ml or less are your safest option for hand luggage on Ryanair.

TSA liquids aerosols gels rule

For travellers connecting through the United States, the Transportation Security Administration applies its own 3-1-1 rule: containers up to 100ml (3.4 ounces), all fitting inside a 1-litre (1 quart) clear zip-top bag, with one bag per passenger. This rule applies to all aerosols without exception. If you’re flying Dublin–New York on Ryanair, you’ll need to satisfy both the EU 100ml rule and the TSA 3-1-1 requirement.

Ryanair specifics

Ryanair requires that all liquids, including aerosols, be placed in a 20cm x 20cm transparent, re-sealable bag that can be separated from your hand luggage during screening. The bag must fit within your hand baggage and be presented separately if requested. Medical liquids and infant milk, food, and sterilised water are exempt from these requirements when needed for the flight.

Where do I put my aerosols when flying?

Placement of aerosols depends on their size and your airline’s policies. The key distinction is between what Dublin Airport security permits at the checkpoint and what Ryanair permits on the aircraft — these are two separate compliance checkpoints, and both must be satisfied.

Carry-on placement

For Ryanair passengers departing Dublin, the ideal strategy is to pack aerosols under 100ml in your 1-litre liquid bag alongside other toiletries. Anything larger than 100ml should be placed in checked luggage or left behind. At Dublin security specifically, the new scanning kiosks mean you no longer need to remove liquids, gels, or electronics from your carry-on — but this convenience doesn’t extend to the Ryanair boarding gate, where cabin bag checks remain strict.

Checked bag placement

For full-size aerosols — hairspray, dry shampoo, large deodorant cans — checked baggage is the appropriate home. Place them in the centre of your suitcase surrounded by clothing to cushion the canister, and ensure the cap is secure. Avoid placing aerosols in exterior pockets or near items that could cause physical damage. Dublin Airport requires that all checked luggage be properly closed, though it does not impose additional restrictions on standard personal care aerosols.

Is it okay to put aerosol in checked baggage?

In most cases, yes — full-size aerosol cans are permitted in checked baggage on Ryanair flights, provided they don’t fall into the prohibited categories of flammable gases, incapacitating chemicals, or explosives. The distinction matters: a 200ml can of hairspray is fine in the hold; a can of pepper spray is not.

Full size cans

Standard personal care aerosols — hairspray, styling mousse, body spray, dry shampoo — are permitted in checked baggage without volume restrictions, subject to the dangerous goods classification. Travellers should verify that the product’s label does not include flammable gas warnings before packing. Airlines may have their own weight limits for checked bags, which indirectly caps how many full-size aerosols you can bring.

Hairspray rules

Hairspray is one of the most commonly carried aerosols and one of the least problematic. Both Dublin Airport and Ryanair allow hairspray in checked baggage. The EU Aviation Safety Agency classifies most consumer hairsprays as non-dangerous goods when the net quantity is under 500ml per item and the product is for personal use. For peace of mind, travellers flying with multiple full-size cans should check their airline’s checked baggage weight allowance and consider whether their specific hairspray brand uses a flammable propellant.

How to pack aerosols for a Ryanair flight from Dublin

Three steps cover most scenarios for Ryanair passengers flying out of Dublin. The critical insight is that you face two separate rule sets: Dublin Airport’s liberal checkpoint rules and Ryanair’s strict onboard policy. Plan your packing around the more restrictive of the two.

1. Sort by size before you pack. Aerosols 100ml or under can travel in your Ryanair-approved 1-litre liquid bag. Anything larger belongs in your checked suitcase. If you have neither checked luggage nor a suitably sized carry-on, the 100ml option is your only compliant path. Personal care items like dry shampoo, deodorant, and hairspray should all be measured against this threshold.
2. Protect your checked aerosols. Place full-size cans inside sealed plastic bags, ideally surrounded by soft clothing. This prevents leaks from spreading through your luggage. Ensure lids and caps are fully secured. Ryanair does not impose specific restrictions on personal care aerosols in checked bags beyond the dangerous goods classification.
3. Account for your airline’s bag limits. Ryanair’s free small personal bag must fit under the seat in front of you — dimensions are 40cm x 30cm x 20cm as of January 2026. Your liquid bag must fit inside this space alongside everything else. If you’re carrying a larger 10kg or 20kg checked bag, aerosols can be packed there without the 100ml constraint. Oversized cabin bags not meeting Ryanair’s size requirements face a €70 gate-checking fee plus VAT on domestic routes.

The previous 100ml maximum limit on liquids and gels no longer applies, and items in containers up to 2 litres can be brought through security.

— Dublin Airport (Official Authority)

Taking liquids, aerosols, and gels into the airport and on-board an aircraft is strictly subject to current EU Security Requirements.

— Ryanair Help Centre (Airline Official Policy)

The tension between Dublin’s welcoming approach to liquids and Ryanair’s strict onboard enforcement creates a two-tier compliance reality for Irish travellers. Dublin Airport has invested in new scanning technology that genuinely changes the passenger experience at security — no more decanting shampoo into tiny bottles, no more wrestling with zip-top bags. But that same passenger, once they reach the Ryanair gate, discovers that the airline’s EU-mandated 100ml cap still governs what can accompany them to their seat. For aerosol-heavy routines — hairspray, dry shampoo, styling products — the practical consequence is clear: cabin travellers need travel-size containers, while those with checked luggage have far more freedom.