Just logging back in tonight. My PC is 12" by 10.5" (Dell Lattitude D610). The briefcase bag I'm using right now is 16" wide by 13" tall, but I've got a smaller one that is 14" x 12" that I've used on the KLR (tied down with bungies).

Appreciate the help!

Thinking about upgrading my KLR650 to either a Multistrada or a Triumph Tiger, mainly so I'll have a better commuter bike and more power. Not doing as much off road as I thought when I bought the KLR and the single doesn't give much umph when at speed or provide as refined of ride and cargo capacity ...