I like brown canvas, rough brown leather (none of that smooth crap), and an overall rugged appearance, but nothing too bulky. I like both messenger-style bags as well as backpacks. It needs to fit a 17" uMBP as well as a few accessories and a slim spiral-bound notebook. I don't like those round-looking messenger bags; I prefer square/rectangular, with rounded corners. It should be comfortable, durable, and not ungodly expensive (<$200, ideally). Thanks!