I just moved to NYC six months ago and I'm seeing everyone with this bag. Unfortunately I don't have any pictures but I'll describe it as best as I can. It's a basic black tote that looks like it's made out of nylon. The handles are a light tan, and it has a tan u-shaped flap that goes over the tote. It looks like the flap is secured with a snap button. The handles and flap look like they are leather. It looks like such a simple, great everyday bag. I'm too embarrassed to ask the women who are carrying it who it's by, and I've tried looking for it online with no luck. I know it's now Kate Spade or Prada, those were two designers that came to mind when I think of black nylon. Any help you can provide would be greatly appreciated! 
You guys are the best! Thanks for your help!