This was our last purchase before the Maine trip. Allow me to introduce you to the Coleman 40 quart Powerchill thermoelectric cooler. It was a great deal at Walmart online (US$70 or so including the car charger as well as the wall outlet adapter--most places charge you extra for either). It held way more than we needed for the week, and with freezer packs, it kept the food cold for long periods without a power hook up. John and I were pretty impressed with it. As far as size goes, it took up half of John's back seat (he has a Jetta). The really useful part about the cooler is that you can switch the hinge position of the door to open it from the other side. We mainly used it like a cooler, and not like a wee fridge as shown here. The only caveat is that if you're going to use it on a road trip, bear in mind that you have to keep the side with the fan (shown here as the top) well ventilated. It significantly heated up the car, so we drove with the windows open often during the trip.