What's up with guys and rolling backpacks?

Is this becoming an epidemic on anyone else's campus? I don't want to sound sexist or anything, but, come on! I'm 110 pounds and even I don't use a rolling backpack. Plus, you're going to get soft and pasty with all that time you'll be spending in the library. Might as well get a little exercise.

[If any of you guys around campus are using the rollies because of some kind of medical condition, I profoundly apologize.]

Rolling backpacks! Really!

Take a look around...