Can You Fly With Dry Ice? 5.5 lb Limit and Airline Approval

Where these numbers come from

Dry ice is the odd item on this list because TSA does not give a flat yes or no. Its listing reads "check with airline" for both carry-on and checked bags. The reason is that dry ice is solid carbon dioxide, a regulated hazardous material that turns to gas as it warms. The FAA allows a small personal amount, but it leaves the final acceptance to each carrier, so a phone call or a look at your airline's dangerous goods page comes before packing.

The limit is 2.5 kg, which is 5.5 lb, per package and per passenger. The math matters at the grocery store: dry ice is sold by the pound, and a 5-lb block plus a 1-lb pad is 6 lb, half a pound over. Two 2-lb blocks give you 4 lb and 1.5 lb of margin. Because dry ice loses mass as it sublimates, weigh it as close to departure as you can and treat the limit as applying to the weight you show at the counter.

The packaging rule is the one people miss. The FAA says the package must not be airtight. A sealed cooler or a screwed-down lid can build pressure as the gas expands, so the cooler needs to vent. Checked bags also need a label that reads "Dry ice" or "Carbon dioxide, solid" together with the net weight or a statement that it holds 2.5 kg (5.5 lb) or less. Agents use that marking to know the bag is not a problem when they see it in the hold.

Dry ice is meant for keeping perishable goods cold, and it can be combined with other coolants. A carry-on cooler can also hold frozen gel ice packs or ice, but any gel that has turned soft falls under the 100 ml liquids rule at the checkpoint. For a full cooler plan, see coolers, and for food and meat rules see snacks and food. Because the 5.5 lb cap is firm, plan your cooling around it and add frozen gel packs for any extra time. Try your exact item in the Can I bring it? TSA finder before you head to the airport.

Sources

• FAA PackSafe: Dry ice
• FAA PackSafe chart
• TSA What Can I Bring? complete list

Figures checked on September 30, 2026.

This page is general information, not legal, insurance or travel-agent advice. Fees, rules and limits change, so confirm the figures with the official sources listed above before you book or travel.