I would never ride with a back pack period; that's why they make saddlebags. Riding with a back pack not only subjects the rider to wind, etc. but will put a serious strain on the riders back and shoulders. I don't care what anyone says, if riding 400-600 mile days, there is no such thing as a "comfortable" seat. Even the most comfortable requires an occasional break from monkey butt, shoulder and back discomfort. A back pack just multiplies the stress and strain. JMHO.:s