To me it looks smaller than the Brief and more structured, but not as much as the overstuffed picture makes it look.
I'm thinking Balenciaga views the Step as a replacement for the dearly departed Purse.
I'm listed for a Violet Step! It looks to have a bit more depth than a Brief, it has feet, and it's a vertical bag. I like the look of it, and if I keep going to the gym and starving myself maybe those handles will accommodate my arms so that I can carry it on my shoulder.
I'm now on the list for a Violet Step too! Woohoo!