This is a great backpack. It could easily be used in a professional environment, as well as in more casual ones. Made in San Francisco by a cool design firm called Waterfield.

It has a nice leather cover and can fit a 15" laptop (there is also a space for your tablet). Retail price is $329, but I'll sell for $250. Here is the link to Waterfield's website: http://www.sfbags.com/products/staad-laptop-backpack