8
These are wild
(master-piece.co.jp)
These designs are super cool to see. They are out there for sure, I do like the outside pocket things. I don't know how useful it would be, but they sure are neat for smaller things that you would use all of the time.
For those who love to travel and don't limit themselves to just one bag.
Inspiration: /r/manybaggers
See also:
Photo credit: Arthur Edelmans