I am beginning college a week from tomorrow!!

I *NEED* a backpack of some sort. I was curious where all of you students got yours? My schools bookstore wants about $50 for a BASIC backpack. I have done some web searching and such but have not been able to turn up anything that I like.

I have to carry four large textbooks (including a $200 French book!! ), a math packet, photography packet (including seven rolls of film, a magnifier, and some other things) and an English to French grammar book. Not to mention the a syllabus for each class (there are four), binders, paper, etc etc etc! I will also probably have to carry my manual camera and lenses with me but I have a special case for that.

I would like a backpack or messenger bag. It needs to be durable, highly preferable for it to be waterproof, and something that won't kill my shoulders and back. Also, I would like for it to be customized or just to have some nice little design that sort of represents me, maybe? (It would also be handy to identify if I ever lost it! ). I am not very concerned with the style of bag (regarding the flap and pockets, etc.).

So my question is where do you students go for your bags and such?