My two older children and I take a lunch/dinner to school or work nearly every day. Generally, the kids take a sandwich, a fruit, and a snack along with a drink. We put the fruit in a plastic bag and use plastic wrap or tin foil for the sandwich. I was very excited, though, to review Buddy Boxes from Sunsella, which are great for helping to eliminate some of the waste, as well as helping with controlling portion sizes.
