I sometimes use a Tumi Balance Backpack, Louis Vuitton Odessa computer bag, and recently got a Tumi LXT Innovation Slim case. I like to mix it up depending upon my mood or client.

After several years the Tumi backpack is showing signs of wear and the zippers are coming apart or getting stuck in certain places. Other than that I like the backpack as it looks a bit more structured / modern than most packs. Reminds me a jet pack. I don't use it when wearing an overcoat and /or suit though.