Good Book bags?

I see the "What's in your bag?" posts all the time. There are a lot of cool, functional bags for laptops out there. The problem for some other High School students and I, who's education system has not yet embraced pricey technology, is there is a lack of unique, stylish, and practical book bags.

Call me a hipster, but I'm tired of carrying around a North Face book bag like every other teenager on the planet. There's nothing necessarily wrong with it, I'm just looking for something that's not only different, but good-looking and capable too.

What I really need is a lot of storage for books, and several large pockets for calculators, and things like index cards.

So, TL;DR: What's a stylish, original, and functional bag that has plenty of storage space?