While I'm a non-rolling luggage fan, this article was brought to my attention and I thought some of you might be interested:
Landor & Hawa Sub Zero G
They come in numerous sizes up to 30" but the two that would work best for carry on are:
20.5 x 14.4 x 7.6 (4.8 lbs)
19 x 13.5 x 7 (4 lbs, 6 oz)
I'm probably not going to buy either one...but it's tempting.
BTW--I'm not affiliated with the company, and those who have the $30 Campmor bag--we know, we know.