I made this back in May just for fun. **Sorry for the blurry pictures** Found the pattern at:
You could use any food box you wanted, provided it was made from a lightweight cardboard. I chose a frozen pizza box. It's really easy to do, took less than 10 minutes. It would be cool to just have in your purse or pocket, show how green you are. I used a rubber band for the closer, but a piece of elastic would have probably been better. I was in a crafting mood though, not a buying mood.
Thanks for looking!