We got the GTO (garment travel organizer) last year when someone posted the sale. Very impressed! This thing kept my spouse organized (for the first time) on our last trip. It held 3 shirts on hangers, 2 pair of pants, and his raincoat. The built-in packing cubes held 6 underwear, 6 socks, 2 pr. pjs, and slippers. All with room to spare.
It fit perfectly in the REI Big Haul 40L duffel (21.3') long, with room at one end of the bag for a hanging toiletry bag.
I also have the Baggie All, which is handy for all sorts of little things.
The C-fold bag I haven't tried. It has a slip pocket to fit over the handle of a rolling bag.
All 3 for $29.95. (Yeah, I know - none of us NEED any more packing aids.)