plastic bags, like te ones that 4 litres of milk come in. Put them over your boots, and stop at any dollar store for a bag of elastics....wrap one eastic around middle of your foot's instap, and another around the shin of your boot. This will help keep bags in place and not flap or get caught while riding..... they will last about 8-12 hrs before they begin to fall apart at the soles. Keep extra milk bags with you. They pack really small and fit almost anywhere. You can even jam them in between your gear and your back seat.