Dry ice:Dry ice is often used in the packaging of perishable items (i.e. fish, seafood) to keep them cool.
Items packed in dry ice are accepted in carry-on or checked baggage provided they are properly wrapped/packed to protect against leakage, then placed in a box, carton or container that:
is properly vented to allow for the release of carbon dioxide gas,
is in good condition and free of any damage.Dry ice must not exceed 2.5 kg (5 lbs) in weight (total weight of 2.5 kg is for carry-on baggage and checked baggage combined per passenger).
Checked baggage restrictions:
Passengers travelling with a dry ice container as checked baggage must:
arrive at the airport at least one hour prior to departure to allow for proper handling of dry ice, and
sign a declaration form that certifies that the package is in good condition and provides a description of contents.Passengers whose itinerary includes a connecting flight with another airline may not travel with a dry ice container as checked baggage due to special handling requirements.
Brine:Brine spillage from fish and seafood is corrosive. Lobsters, mussels, oysters etc. must be packaged in leak proof containers and then be packed in plastic bags inside *waxed* cartons. Perishable items require that a limited release form be signed at check-in.
Gel/ice packs:Gel and ice packs are subject to all liquid and gel restrictions (see Liquids and gels link above).
If you must keep an item cool you may want to use frozen peas as an alternative to a gel/ice pack.
Exception: gel/ice packs that are used to refrigerate medication are exempt from these restrictions, provided the medication bears a label or is accompanied by a doctor’s/pharmacist’s note stating that refrigeration is required.