The author of Big Red Kitchen has some wonderful posts and ideas, including: freezing a week's worth of sandwiches, how to keep/care hot and cold dinners to baseball games, etc.
My only additional advice: If you're a parent who works and then picks up your child from school and then goes to a game, etc., consider taking the dinner with you to work (if you have a fridge and microwave) and heating it up there and then taking it with you.
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