When my children were young and we would travel in the car I would always have paper, crayons, etc. in the car so they would not get bored. I would take the plastic grocery bags flatten them out and then roll then up so they would be about the size of a cigarette lighter. Tie them with a twist tie and keep them in the glove compartment. So when we were traveling and the kids had a huge mess we would stop at a road side rest gather up the mess and throw it away. The kids then had more room to make more fun, and of course more mess. Kept them quiet.
By Claudia