We've been using a "wrap-n-mat" in my son's lunchbox for a couple of years and that worked well to provide him with a clean surface for his lunch while at school (can't count on the tables being clean since they are just wiped down with a damp rag between classes). But half-way through third grade, my son didn't want to use them anymore. Taking the extra step made him feel different than the other kids and he just likes to blend in.
This lunchbox (Solvetta Flatbox) is awesome and solves our problem. It is also great for summer camp and picnics. The sides zip down to create a placemat. It is plenty big enough for a kid and looks cool. All his friends want one.
Just toss it in the washing machine to clean it.
Now he has a clean surface to eat on and doesn't feel weird or different.
Just thought I'd share in case anyone else was dealing with this same issue.