I can't believe everything I need for a 15 day trip to Japan fit inside this small duffel bag. It's less than 10 lbs oand there is still room in it. Of course I'm wearing heavy things on the plane and also taking a day pack for the trails. No need for a roller bag.
https://www.rei.com/product/235565/rei-co-op-big-haul-40-duffel