I'm looking to get a waterproof bag to replace my North Face Heckler, which leaks like a sieve. I'd prefer a backpack, but I'm open to messenger bags too if they work better. I've already looked at the Banjo Brothers commuter backpack (my front runner at the moment), and the Ortlieb bags, which I'm not crazy about in the looks department. I need to be able to keep my absurdly expensive engineering textbooks dry, and I'd like some organizer things for pens, calculator etc. What do you guys use / recommend? Let's keep the price under $120 or so.