I have a 30" Load Warrior rolling duffel made by Eagle Creek. It was not cheap but is well-made. The 22" tripod disappears inside. When I travel, I tend to take a minimum of clothing, but even on 28 day cruises, I've yet to fill it up. If it were to be full, it would probably be overweight. The empty duffel weights about 8lbs, 4Kg.
Alan