OK I'm a new guy here, but a veteran on other boards. I've heard some folks take their casebooks to Kinko's and get them unbound and rebound in thirds. That way they take only a third of their casebook to class. It costs maybe $5 but can alleviate some back troubles. If you want a more thorough explanation then go to nontradlaw.com and search Kinko's. As for me, I plan on using my Kelty internal frame pack. Its 2900 cu.in and kinda big, but we'll see how it works out.
i don't think anyone is going to care if you have the rolling backpack or not. it's not highschool.