Can I bring ice packs in my cooler through carry-on security?

Yes, as long as they're frozen solid. Once a gel pack starts to melt and becomes slushy, it's treated as a liquid and must meet the 3.4 oz (100 mL) container limit unless it's in checked baggage.

Can I pack dry ice in my cooler?

Yes, up to 5.5 lbs (2.5 kg) per passenger, but the package must allow gas to vent — never seal dry ice in an airtight container — and it needs to be labeled with its weight. You also need to tell the airline in advance, since some restrict or ban it.

Is loose ice allowed in a cooler?

Not in carry-on. In checked baggage, loose ice is allowed only if it's completely frozen when you check your bag.

Cooler

Coolers are allowed in carry-on and checked bags; what's allowed inside depends on whether it's frozen solid, gel, or dry ice.

Carry-on

Allowed with conditions

Checked

Allowed

Carry-on details

Allowed, with conditions on the contents. An empty or food-packed cooler isn't restricted itself. Frozen food and fully frozen gel ice packs are allowed through the carry-on checkpoint with no limit. If an ice pack or the food inside has started to melt and turns slushy or liquid, it falls under the 3-1-1 liquids rule and must fit in a 3.4 oz (100 mL) container unless it's still frozen solid. Loose (non-bagged) ice is not allowed in carry-on.

Checked-bag details

Allowed. Checked coolers have no liquids restriction, so melted ice packs and liquid-based cold sources are fine. Loose ice is allowed only if it's fully frozen at check-in, since airlines don't want free water sloshing around in the cargo hold. If you're using dry ice to keep contents cold, that's a separate hazmat rule: up to 5.5 lbs (2.5 kg) per passenger, in a package that vents (never airtight), clearly marked with the net weight and the words "Dry Ice" or "Carbon Dioxide, Solid," and you must tell the airline you're carrying it.

Special instructions

Freeze gel packs solid before you leave for the airport — partially thawed packs are the most common reason coolers get flagged at the carry-on checkpoint. If using dry ice, confirm your airline allows it and follow their notification process; unvented, sealed containers of dry ice are not permitted on any flight.

Related rules

Which Foods Count as Liquids?

FAQ

Can I bring ice packs in my cooler through carry-on security?: Yes, as long as they're frozen solid. Once a gel pack starts to melt and becomes slushy, it's treated as a liquid and must meet the 3.4 oz (100 mL) container limit unless it's in checked baggage.
Can I pack dry ice in my cooler?: Yes, up to 5.5 lbs (2.5 kg) per passenger, but the package must allow gas to vent — never seal dry ice in an airtight container — and it needs to be labeled with its weight. You also need to tell the airline in advance, since some restrict or ban it.
Is loose ice allowed in a cooler?: Not in carry-on. In checked baggage, loose ice is allowed only if it's completely frozen when you check your bag.

Related items

Sources: TSA — What Can I Bring?, FAA — PackSafe (Hazardous Materials) · Last verified: 2026-07-31

Final decision rests with the security officer at the checkpoint.