I bought a bit of rug liner and use it in all our cars (also under my sewing machine foot pedal). It is a rubber grid and is sold at fabric stores with the upholstery fabrics. It runs about $14 and is 54" wide. You only need 1/2" and with a coupon - real cheap. I holds my rolling bags in place and my kids love it for their grocery bags and tool box (they have CRVs).