City has the F part of the top roll closure bonded into the sides of the bag , M part of the buckle on both ends..
the other one, rolls closed the same way,
but has 1M & 1 F buckle to either snap together or snap into the 2 ends of the shoulder strap,
that on the road hooks into the cleat on the lower outside of the bag..
and does include a zip pocket inside that is against the stiffener panel..
You are free to add a girth strap of your own choosing to go around the bag ...