I assume you are assuming a front-loader. If I want to fill a box, I don't turn it on its side, so I bought a chest fridge. Starting out one early trip, my 43-quart (40-liter, 1.4cuft) Engel fridge held at one time: 6 soft drinks, a gallon of milk, 6 eggs, 12 sausages, 6 muffins, 7-oz margarine tub, 2 12-oz jars jelly, 4 oz block of cheese, 15 cheese sticks, 8 oz sliced Swiss cheese, a full making of Kraft Mac&Cheese (in two containers), 6 oz meat loaf, about 6 oz ham, a head of lettuce, a green pepper, 4 radishes, 9 oz spinach (1.5 bags not smushed), 4 oz ranch dressing. The fridge was full, but not solidly packed--no special effort needed to make things fit or to find them. These days, I normally start trips with a week's worth of home-prepared meals. We stop at stores often enough to not run out of milk--every three days or so--and fridge space is almost never an issue.
Dave, you and I were posting simultaneously. I also bought that fridge because it was the only one I found that fit my available space. You're gonna love it.