I prefer the messenger type bags. The shape of them usually seems more conducive to carrying books. That's what I take to school. I'm only taking two classes right now, so I only carry one book and the chapters I need for the other (it's not a typical book, it's loose leaf and you put it in a binder).
In your case, I'd carry a backpack with part of the books and a shoulder type bag for the others. I'd hate to try and put that much in any single bag.
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