You can more easily get strong canvas grocery bags, with and without branding.

Including ones with two sizes of handles (one set of handles for dangling from hands, the others for slinging over shoulder), which I guess you could alternate based on whether you're visible to to muggers.

I even saw a canvas design that had a color and finish to look very reminiscent of grocery store brown paper bags.

The similar bookstore canvas tote bags might be seen as more likely to contain a laptop or tablet (since some people use them just like others do backpacks). So I like the grocery one.

One advantage of the movie prop one -- in the office -- is that I could imagine a stylish designer type carrying it to a conference room table, more easily than a frumpier canvas bag.

Personally, I use a functional plain all-black backpack that looks presentable in the office (including carrying into the conference room, but put on the floor/chair), yet understated on the street.