Make your own ice pack
Unless you’re popping half an hour down the road, the chances are you’ll need to snack while on your travels. Sure, they serve food at the airport, but it’s usually expensive and not that healthy. Also, if you’re traveling with children, they can be pretty picky about unusual food.
To keep your own snacks fresh all the way to your destination, all you need is a sealable plastic bag, a dishwashing sponge, and some water. The night before your trip soak the sponge and put it inside the plastic bag, sealing it tightly. Then freeze the bag, get it out the next morning, and place it in your snack pack.