Laptop Backpack

I have a Swiss Gear backpack that gets light use. I bought it to carry around a 13" Macbook, Video Camera, DSLR, Cables, and Paperwork during IPCPR two years ago. The bag itself is pretty hefty and it weighs a ton when you load it up. I was amazed at how comfortable it was to carry around for several hours on a convention center floor. It doesn't breathe well so I wind up being soaked after wearing it for more than an hour.

You should definitely go somewhere where you can try one on. I tried a few on before I bought mine and a bunch of them felt awkward on my back. Definitely need one that fits you well if you plan on using it often.