How much dry ice can I bring on a plane?

Maximum 2.5 kg (5.5 lbs) per passenger in vented packaging. This limit applies to both carry-on and checked baggage and must be declared to the airline at check-in.

Can dry ice go in checked luggage?

Yes, the same 2.5 kg limit applies to checked baggage. The packaging must allow CO2 gas to vent and must be labeled 'Dry Ice' with the net weight. Declare it at check-in.

Do I need to tell the airline I have dry ice?

Yes — dry ice must always be declared to the airline at check-in and at the security checkpoint. Undeclared dry ice is a serious hazard compliance issue.

Can I use gel packs instead of dry ice on a plane?

Frozen gel packs are much easier to travel with — when frozen solid they have no restrictions, require no declaration, and work well for keeping food and medication cold for several hours.

Can You Bring Dry Ice on a Plane? Limited Quantity

Yes, dry ice is allowed on planes — but with strict quantity limits, specific packaging requirements, and a mandatory declaration to the airline. If you need to keep medication, food, or perishables cold during a flight, dry ice is a viable option as long as you follow the rules.

The Limit: 2.5 kg Per Passenger

Both the FAA (US) and IATA (international) allow dry ice on passenger aircraft at a maximum of 2.5 kg (approximately 5.5 lbs) per passenger. This limit applies to both carry-on and checked baggage.

This is a per-person limit, not a per-bag limit. If you are traveling with a companion who does not need dry ice, they cannot carry additional dry ice on your behalf — each passenger's 2.5 kg limit is individual.

Why Dry Ice Is Regulated

Dry ice is solid carbon dioxide (CO2). At room temperature, it sublimates — it converts from solid directly to gas without becoming liquid first. This is useful for keeping things cold, but it creates a hazard on aircraft.

In an enclosed space like an aircraft cabin or cargo hold, CO2 gas can accumulate to dangerous concentrations if dry ice is in a sealed container. High CO2 concentrations can cause dizziness, loss of consciousness, and asphyxiation. The 2.5 kg limit and vented packaging requirement exist specifically to keep sublimated CO2 at safe levels.

Packaging Requirements

Vented packaging is mandatory. The container holding your dry ice must allow CO2 gas to escape. A sealed, airtight container — like a sealed Tupperware, a vacuum flask, or any container with a locking lid that forms an airtight seal — is not permitted.

The packaging must be labeled with:

The words "Dry Ice" or "Carbon Dioxide Solid"
The net weight of the dry ice in the package

Styrofoam coolers with loose-fitting lids, vented cooler bags, and packaging with small holes or venting holes all work. Many pharmacies that dispense temperature-sensitive medication provide appropriate packaging when they include dry ice.

Declaring Dry Ice to the Airline

Dry ice is classified as a Dangerous Good (UN 1845) under IATA regulations. This means you must declare it — verbally and in writing where required — at both check-in and at the security checkpoint.

At check-in: tell the agent you have dry ice, how much you have, and in which bag. Most airlines will provide or require a Dangerous Goods label for the bag.

At security: inform the TSA officer (or equivalent) that your bag contains dry ice.

Failing to declare dry ice is a serious compliance issue. Airlines can refuse to board passengers who do not follow declaration requirements, and undeclared hazardous materials are subject to significant fines.

Not All Airlines Accept Dry Ice

While IATA permits dry ice on passenger aircraft, individual airlines set their own acceptance policies, and some are more restrictive than the standard limit or require advance notice.

Always contact your airline before travel to:

Confirm they accept dry ice on the specific route
Understand any airline-specific declaration or labeling requirements
Ask whether any advance notice is required

Some low-cost carriers have stricter rules or require prior written approval for dangerous goods. A phone call before you travel is far better than a surprise at the check-in counter.

Common Use Cases

Insulin and temperature-sensitive medication: Dry ice keeps insulin below the required temperature for much longer than gel packs or refrigerants. For diabetic travelers on long-haul flights, dry ice is often the most reliable option. Medical dry ice is typically packaged appropriately by pharmacies.

Breast milk: Expressed breast milk needs to stay cold. The TSA has separate rules for breast milk (it is exempt from the 3-1-1 liquid rule), and dry ice is an acceptable way to keep it cold in transit.

Perishable food: If you are transporting perishable food — local delicacies, seafood, meat — dry ice keeps items frozen longer than any alternative. The 2.5 kg limit provides meaningful cooling capacity for a day of travel.

Gel Packs: The Easier Alternative

For many travelers, frozen gel packs are a better solution than dry ice. When frozen solid, gel packs:

Have no quantity restrictions
Require no declaration to the airline
Do not sublimate into gas
Work in both carry-on and checked baggage without special packaging
Are widely available and inexpensive

The trade-off is cooling duration. Dry ice maintains much lower temperatures for longer. For truly temperature-sensitive items (like insulin that must not freeze), dry ice gives more precise temperature control.

If your goal is simply to keep food cold for a few hours, a frozen gel pack is the simpler choice. If you need sustained sub-zero temperatures or long-haul cold chain transport, dry ice is worth the additional preparation.

Summary

Rule	Detail
Maximum quantity	2.5 kg (5.5 lbs) per passenger
Applies to	Carry-on and checked baggage (same limit)
Packaging	Must be vented — not airtight
Labeling required	"Dry Ice" or "Carbon Dioxide Solid" plus net weight
Declaration	Required at check-in and security
Airline approval	Check with your airline before you fly