Folks have been trying to turn Patagonia backpacks into computer bags for years, so finally they came out with a bag that's made specifically for computers. It's padded and roomy, with lots of pockets for your accessories, books and stash. What I like about it is that it carries vertically which makes it fit your body well and the shoulder strap lets it ride behind you, leaving your arms free for other tasks. I have these in the colors Black, Iron Wood and Chili.
COMPUTER / ACCESSORIES NOT INCLUDED
The bag measures 11" wide by 6" deep by 15.5" tall. The computer sleeve measures 10" wide x 1.75" deep x 13"-14.5" tall, with 13" being the optimum. If the computer is longer that 13" the interior strap won't buckle, but you will still be able to zip the bag shut.