Who cares? I have 4 of the damn thing. They are call messenger back, flight bag or whatever but the point is that it is difficult to carry your wallet, keys, phone, train pass, work ID, iPad and then some paperwork with me daily without a bad. I am not going to carry a suitcase when I can get something that I can sling over my shoulder. small backpacks are prone to pickpockets (first hand experience) and they are weird shape in that an A4 piece of paper gets bent.
In terms of function, they work.
In terms of form, they look good.
Do I care what a bunch of strangers think of me? Absolutely not.