I use a Duragear large bucket seat cover for the dogs. Designed for pets, but I have used it after biking as well. It appears to have been discontinued. If I were buying a new one, I would probably order a Kurgo Bucket Seat cover from Amazon and then send it back if it did not fit right. My point being, look for a pet bucket seat cover and you should be good. May not be the most attractive solution, but likely better than a towel.