I just use a Timbuk2 Commuter bag made from olive green/grey ballistic nylon. 9 years, 5 bike wrecks, still going strong. Made in the USA, $45 on eBay, looks like something a 20 year old would wear, don't really care.
Filsons have always looked busy to me. Too many zippers, stitch points, etc, on the exterior (actually, I think it's the top handles that blow the aesthetic for me... I'm a shoulder strap guy, cross-body style. Then again, I also ride bikes and motorcycles and don't like backpacks, so that leaves me with...)... Plus, they're look old-fashioned. While that is an acceptable aesthetic to some (I'm a sucker for vintage chambray and western shirts, not to mention ecstatic about the work boot revival), there's something about the Filson look that bothers me. I much prefer, say, a vintage leather mail bag over the 257.