This is a black waist pouch! It looks like a shiny leather material.

This is a waist pouch. I used to use it a lot, but recently I've been carrying more items, and this bag can no longer hold everything, so I stopped using it.
The second photo shows some fuzziness on the lower back of the bag. I didn't mind it because it was on the back, but if you're concerned about it, you might want to reconsider!
The third and fourth photos show the inside of the bag. The fourth photo shows that there are dividers/pockets inside the pouch as well. I thought it might be hard to see because it's so dark, so I placed a Gintoki figure there to make it easier to understand!

Thank you for looking!