Keep a cooler, any kind, in your car winter or summer to keep frozen food frozen, and to keep perishables, fruits and vegetables from freezing or becoming too hot. I use the really thick styrofoam ones that meat is sometimes delivered in. They are lightweight but very thick and well insulated. But any type of cooler is a plus for transporting valuable food items, especially if you have to make unplanned stops on the way home, such as the gas station or library etc.
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I use those thermal bags with handles that snap together. They take up alot less room in my trunk. I got mine at Walmart for a couple of dollars apiece, but I have seen them at other grocery stores, too.
My company makes refridgeration units for the trunks of cars for this specific use. Works great. Ice Cream, Milk, frozen foods all stay ice cold until you get home. Even makes it possible to take the long way home from the grocery store on a hot summer day. (12/03/2004)