My wife and I drove from West Virginia to explore the west. as I am incredibly stubborn about reaching a mileage quota for any day of travel, I found that I could perform an exchange, with the help of a compassionate and understanding wife, by placing the baxter ultrabag on the passenger sun visor clip and setting the drain bag in the floor. It takes quite a while to complete an exchange given the laws of gravity and the height, or lack thereof, in the car, but there it is. Sixty miles on the odometer and an exchange complete. We made it to Santa Monica and ran out of road