Just a word of caution with Ortliebs, with what you throw in them...

They are extremely waterproof. But that also means they keep moisture in as well as moisture out. I had the unfortunate experience of having a twist-off cap from a soda bottle come off (still don't know how) in the bag. It was unfortunate because I also had my computer in there. Yup, the computer was fried because it was sitting in a pool of soda all the way home.