I hate my Arkel handlebar bag.
It's a giant bucket without any compartments - to speak of.
Given how many backpacks and soft briefcases have all the pencil, change, hidden pockets -
I don't see why Arkel couldn't have done that with the handlebar bag.

What's worse, the GT-54s have far too many pouches in the back - where you don't need them.
I regret my purchase of the 5-piece set - the front panniers are actually pretty darn good.
But they are heavy, clunky, and the handlebar bag is the worst.