This is what I do as well. My wife and I use our crock pot on a regular basis and it allows us to have leftovers for at least one night and allows me to take some in to work as well. My usual staple though is lunch meat sandwich on multi-grain bread, some fruit (apple, peaches, clemetines), a yogurt and some pretzels or tortilla chips. Sometimes I'll do PB&J or make a tuna salad as well.