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Bring a large enough bag. Pack your suitcase a few days before the trip. Pack an additional "carry-on" bag. Prepare your snacks. Pack emergency supplies.
You don't want to be cramming all your hand luggage into your handbag. This gives you time to think about adding things in or taking things out and will generally make you less stressed before the trip. Pack comfortably. This could include some books, electronic entertainment (handheld games, mp3 players, laptops, DVDs if the car has a DVD player, etc.), non-perishable snacks (such as granola bars and cookies), and drinks if you have a cooler.  Remember that if you bring carbonated drinks, they may go flat.  Pack a pillow to sleep well. You could go to your local library and check out books. Or get new books on your Kindle. Books are a good and easy way to pass time in the car. You could also get magazines or newspaper articles. Talk to your family. Find out who wants to watch which movie at what time. It can become a big problem when you all want to watch a different movie or listen to different music. It's better to prepare your snacks beforehand than be scrambling to fill resealable bags at the last second. If your whole family is sharing a snack, don't bring the whole bag. Then you have to pass the bag around the car. It's easier to separate servings into resealable bags or plastic food containers so each family member can their own snack.  Some good snacks to take might be:   Pretzels, chips Cheese sticks Veggies such as celery bite-sized pieces, carrot sticks and cherry tomatoes Fruit such as mandarins and apple slices. In case there's a breakdown or accident, pack blankets, torches, a first aid kit including painkillers, drinking water and extra snacks.