[dc]I[/dc] walk to and from ye old day job, just about a mile away, each day, everyday, rain or shine or snow. I used to lug around a messenger bag, but it being overstuffed and combined with the walk and all the one weight on one shoulder, I started to have back problems.
Enter the backpack. It isn’t as fancy as a brief case, or even my old messenger bag, but it gets the job done. I don’t have back issues any more.