First, I'd make sure the capes are fleshed and salted, and hopefully at least partially dry, although with a last minute bull, this isn't possible. Wrap the salted capes up, hair side out, salt and all and stuff into a game bag (regular or large old pillow cases work well). You can tie cord around the game bags to compress the cape a bit if space is an issue. Salt will cure the hides so they won't spoil. As Jimss says above, freezing is another option but may be hard to achieve.....and doubt you are going through Anchorage on a CBG Caribou hunt that ends back in Daytona. As per cooler size, four caribou loins and four backstraps aren't very heavy or going to take up much space, and again will easily fit in a regular pillow case game bag with a lot of room to spare. I'd check your coolers to see if how 3 bed pillows fit in each one, and take the one that seems to work the best. Oh, and place each cape and the meat bag into tough plastic bags. Don't buy treated garbage bags as that will contaminate the meat......or at least turn them inside out prior to use. Good luck on your hunt......who are you going with?