I ended up purchasing the Ogio Dapper bag a few months ago, and thought I would update the thread.
OGIO - Dapper Garment Bag. 108129--2.8 lbs, 21" x 12" x 9", nylon (~$65-75)--I purchased it for about $60 on ebay.
It is very light and great for 2-3 day trips (for my style of packing)--could probably push it to 4 but would likely switch to a roller for 4 days or longer.
It is fine for taking 3 days worth of hanging clothes--an extra pair of pants and shirts--perhaps a sports jacket (not usual for me). I put sneakers and workout paraphenalia in one of the end pockets. Socks, toiletries and some miscellaneous in the middle that is surrounded by the hanging clothes. The other end pocket has a few miscellaneous items I want to be ready for easy access (liquids in quart zip lock, power bar, power cords not in my briefcase, DVDs for entertainment, etc.). On my recent 3 day trip, there was plenty of room for stuff I might have acquired along the way.
Overall a very functional design....at first I was a bit annoyed at the zippers being on the stiff side and not really easy to work...but after several uses, I have either become more facile or the zippers and material stiffliness have loosened up a bit. If there was one improvement, it would be to have zippers that lock when the zipper pulls are down and to make the zippers a bit easier to manipulate.
Definitely a nice bag for short trips when you want it easy to get in the overhead bins and want to not be a bin hog.