|Both from http://blog.modes4u.com/tag/lunch-box|
There's also the green factor. Where I taught preschool, the children had to bring their lunches. You would be amazed at the amount of trash that was accumulated from eight kids' lunches. Bentos will also help cut down on the cost of packing a lunch. Instead of buying individually portioned bags of pretzels, buy one regular bag and dole out five at a time.
If you're interested in bento lunches - two great websites are lunchinabox.net and anotherlunch.com.