So you roll with a murse over one of those belly bags?
Haha that's just a backpack with only one strap on. I only really use a man-purse if I have to take my laptop somewhere for some reason. These are the bags that are The Look right now, though; not too far removed from an 18th-c. soldier's haversack slung from a crossbelt;

But at $4k I'm thinking some old piece of army gear like a map case would be better and more original, or one of those courier things that have the hair on.
There are some designers trying to make the fanny pack happen, usually with more of a hard-sided luggage-looking thing instead of just a nylon zipper pouch but no one I know is having it.
With the latest developments in manpurses, this has been your style correspondent Gay_Dubb.