I don't know about you, but I've always had a problem with people wanting to know what's in my lunch. From grade school to work places, I've had my Holly Hobby lunchbox to my brown paper sack pawed and gone through seeing if there was something in there worth offering a trade for or to mooch.
I think I've solved one of the problems. That one being the lunch bag itself. I figured if I disguised it in such a way to repel people rather to invite them, perhaps they would leave my lunch alone.