I use one from time to time, when on self powered two wheels, as well as gas powered. I remember a run from Big Bend back to the house a few years back, 8 hours in the saddle in Texas heat, and I rolled up to the house fresh as a daisy! Well, my head was anyway. At gas stops, I would half fill the CB with ice from the soda fountain, then the rest with Gatorade. The ice, as it melted, is a good coolant on my back.