When I went I used a regular cooker froze the fish then got some dry ice from a grocery store and put that on the fish it stayed frozen all the way home.
Just a regular size cooler will be plenty. The kind you bring in the car to haul food and drinks. Your catch will be fillets in zip lock bags. Bring your own extra large zip lock baggies to freeze and transport your catch in your car or on a plane in baggage.
Idk, try asking the Charter?
It depends on what you catch but a regular 12 by 16 is what I bring.
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