I used to have the huge B&W box. It was a bit of a pain, TBH - slightly bigger than maximum luggage size, really heavy, and then customs tore it apart prising it open when it was unlocked.
The B-bag was much better, especially with some tactically-placed cardboard to stiffen the walls a bit. Suspect the new one is a bit better balanced, too.
I used to have the huge B&W box. It was a bit of a pain, TBH - slightly bigger than maximum luggage size, really heavy, and then customs tore it apart prising it open when it was unlocked.
The B-bag was much better, especially with some tactically-placed cardboard to stiffen the walls a bit. Suspect the new one is a bit better balanced, too.