An ice pack meets four separate gates on its journey, and each takes its rules from a different place. The same pack can pass in checked baggage and be stopped at cabin security; in road parcels the decision usually looks at the goods in the box before the pack.
| Channel | Who sets the rule | Position for ice packs |
|---|---|---|
| Cabin | SHGM security rule | A gel pack counts as a liquid or gel: containers of up to 100 ml, one 1-litre resealable bag |
| Checked baggage | Airline | No liquids restriction; airline policy applies to dangerous goods |
| Commercial air cargo | Airline and IATA rules | Gel packs are mostly unrestricted; dry ice is declared as UN1845 |
| Road parcel | Parcel carrier's content policy | Separate rules for perishable food, medicines and specimens |
The cabin rule makes no separate exception for frozen packs. The SHGM exception covers prescribed medicines and baby food; a cooling pack next to a medicine does not fall under it automatically. If you need to carry one in the cabin, use small packs or ask your airline in advance how departure and transfer airports handle them.
The type of coolant changes the rule
The safety data sheet for one Cryopak gel pack lists the contents as water and less than 2% sodium polyacrylate and states that the pack is not regulated under IATA dangerous goods rules. Dry ice is solid carbon dioxide. IATA allows a passenger up to 2.5 kg of dry ice per person to cool perishables; the packaging must let the gas escape, and checked baggage must be marked dry ice with the net weight. Turkish Airlines lists the same 2.5 kg limit for cabin and checked baggage. In commercial cargo a dry-ice package follows Packing Instruction 954 and carries UN1845 and a Class 9 label. A battery-powered cooler also brings battery rules into play.
Sending by parcel
- get the carrier's content policy in writing before sending
- pack the ice packs fully frozen and put a separating layer between them and the goods
- use an inner bag or absorbent against leaks
- mark the contents and temperature requirement on the outside
- compare the carrier's delivery time with the measured holding time of the box; if the gap does not close, choose a better insulated box or another transport route
For dry-ice limits in detail, see dry-ice limits on aircraft and ships; for packing chilled goods, see shipping chilled goods by air cargo.
