WTG! I like my straps for 2 reasons. I like my hands and arms free and I don't like dark handles. Who cares if it matches perfectly? It looks great to me and it gives us a lot more options. I never could understand why Balenciaga couldn't do like LV does and sell the straps.
It's such a good match that at first I thought you simply confused a city with a work that had a strap.
I am one of the people that is content that Balenciaga does not make Works with straps; I think it looks unprofessional. I like how the strap on the city and first looks, though I don't ever use the straps.