I have one of those little nylon trash bags that has a drawstring at the top and the bottom folds over a couple times and closes with velcro. It has a small strip if velcro on the side near the top opening the kinda holds on to the carpet on the center section right in front of my driver's seat. This allows me to toss in the small stuff that always seems to migrate to the car and keep it relativly clean. Any thing larger gets thrown away when I leave the car next.