a hard sided cooler always does better for us than soft. IF you must use a soft sided bag type cooler, put the whole bag in the freezer. Also, if you get those cheap thin hot/cold bags - often in the frozen grocery isle and put the food in that with the ice packs and put the whole thing in the soft cooler, (so it is doubled) it works better. If there is any food you can freeze to help keep the other food cold, that also works. Ham is usually ok after freezing for instance. Packing the cooler full also helps. Freeze water bottles to fill any empty space. Finally, I pack any food we need during the trip separately from food needed at our destination. Opening and closing the cooler lets hot air in and will compromise the contents.
dd1 10/05
dd2 11/09
and ... a mini poodle!