If the meat is frozen solid, then I recommend Rubbermaid Roughneck totes. I think we primarily use the 18 gallon size, and easily get 60-75#s in one; something like $10 apiece in various Anchorage stores. I typically drill a few holes around the top and use zip-ties to secure the lid. Pretty normal for us to travel to the L48 (normally Charlotte/Atlanta/Orlando) with 150 pounds of meat/fish and I've never had a problem with thawing. They're lightweight, durable, waterproof and inexpensive. If you must, you can line it with newspaper for insulation, but marked as frozen with Alaska airlines has worked just fine. I've transported frozen meat/fish this way on dozens of trips to the L48 and undoubtedly will do it again the next trip to see friends/family.
