Hmmm... I was looking at the runway photo of the Keepall with a shoulder strap... it would look cool. BUT... when you aren't using the shoulder strap, it looked weird on the side where the pocket and the piece for the shoulder strap collide... :s
I know that probably didn't make much sense but I tried my best.
I actually like it better without the shoulder strap- I never like using the shoulder strap on duffles like that anyway because the always flex down in the middle, giving the bag a V- like shape. KWIM?