Space is no issue for us at all in our conversion van. So we started taking a big cooler. In it we put frozen meats, a nearly full gallon of frozen milk, a nearly full gallon of frozen water, butter, and some frozen veggies. Then I pack ice cubes around everything. We make the 16 hour trip straight through and I have never had a melting problem. I also take a decent size rubbermade container full of our dry goods, (pasta, cereal, sauce, salt and pepper, ketchup, mustard, mayo, dry soups, canned goods). The last trip we made a few weeks ago I did not have to go to the grocery store at all. On the way home we use the cooler and container for storage.