i don't think anyone is going to care if you have the rolling backpack or not. it's not highschool.
Okay, I just have a little story about this:
In b-school, the 2nd yrs had been given these huge backpacks that hold your laptop and several huge books, but were heavy as hell. The 1st yrs, OTOH, got these nice, slim computer bags and were told to buy whatever lightweight backpack they'd like to carry around their books with the theory being that it's easier on the back.
Well, the 1st yrs went out and bought those rolling cases, which clacked so much on the tile floor that all the 2nd yrs made fun of them all day long. It was extremely annoying during exams to hear a 1st yr clacking down the hall, and any 2nd yr that bought a rolling case was immediately derided (not that many of them did).
Tell me that's not high school.
Of course, I'm sure ls students are much more mature, as evidenced on this and other boards