I'd always counted Filson out as a possibility because all of the buckles and straps look really obnoxious to deal with - I can't picture having to pack up my laptop and get off the train quickly when I have four things to buckle before I can pick it up - but the laptop briefcase looks like a possible contender. The strap looks incredibly uncomfortable, though. I'll have to look around for something wider and more padded to potentially swap it out for.
Does anyone know about how heavy they are? The Filson web site doesn't say.