Originally Posted by
invisiblehand
I vaguely recall some folks using the rear rack to support a backpack with the top of the backpack strapped to the saddle and seat post.
I just want to mention if you buy a variety of sizes of back packs,depending on what you are doing you can choose the right one to suit the trip/day.Best places to find some good deals is a local thrift shop instead of spending a small fortune.Also if you rig the pack right you can still fold the rear wheel under the bike with out removing the pack.