Although I use plastic containers for sandwiches and salads, I use aluminium foil for tortilla wraps because it is the only material (I have found so far) that helps them keep their shape. My tip for you today is simply to reuse the foil for your next wrap! When time for lunch comes, we tend to unwrap our nicely prepared lunch, crunch up the paper or foil and throw it in the bin. But you should not because it is unlikely it was stained by the filling. All you should actually do and fold your piece of foil nicely and put it back inside your pack lunch box for next time.