We first went with the waxed fish box. Only time we used them was when we went to Alaska. They smelled after a few trips. They fell apart eventually. We now go the cooler route. They're inexpensive, can use them on the boat thoughout the year. Simple water wash and a wipe with diluted bleach to sanitize if they get ripe and they are good as new. I have been hauling the same cooler round trip for more than 10 years now. It gets filled with gear for the flight up, vacuum packed filets for the flight down. If we can find it, a 5 pound block of dry ice gets cut into pieces and divided amongst the three coolers. I think we come just under 70 lbs. with a 50 quart cooler and once had 95 lbs. in a 80 quart model. Fish is always frozen when we get home (SEA). Definitely helps to have a good hard freeze to start with. One thing we do when traveling as a group is duct tape the rod cases together. We use those big black Plano tubes so they can't lose them easily. By combining, we gain two checked bags between the three of us.

Have fun on your trip, we always do!