LL Bean has an excellent carry on sized rolling duffle that durable and folds flat. [u][/u]
It's called the Adventure Rolling Duffle
It comes in many sizes and colors but the Medium is the carry on size
23"X11"X11" I and many friends have used them.
Storing them onboard is no <a href="problhttps://www.bing.com/cr?h=SJkFgg1e16BVPqDyipSVSpF-ZOcURdnuQKNG3rJiwow&v=1&r=https%3A%2F%2Fwww.llbean.com%2Fllb%2Fshop%2F63915%3Fpage%3Dadventure-rolling-duffle-medium&IG=F4FDC331764947D1BE160AAA0C0329B2&CID=2C7F2AB9335C65AF0C742253375C66FA&p=SERP" target="_blank">problhttps://www.bing.com/cr?h=SJkFgg1e16BVPqDyipSVSpF-ZOcURdnuQKNG3rJiwow&v=1&r=https%3A%2F%2Fwww.llbean.com%2Fllb%2Fshop%2F63915%3Fpage%3Dadventure-rolling-duffle-medium&IG=F4FDC331764947D1BE160AAA0C0329B2&CID=2C7F2AB9335C65AF0C742253375C66FA&p=SERP</a>,5128.1em $99.00 each