You say your threadbare messenger bag doesn't go with your new professional image? It might be time for an upgrade. It's less expensive that you might think. Through December 31, Meritline has seven laptop bags listed at 40% off, with $6 shipping in many cases.
Pictured here is the most polished of the bunch (in "leather-esque" material), but different styles are available to suit your "other" life as a nouveau-ballistic-nylon adventurer.