So here's a fun fact for y'all: there's an attested practice of tanning human skin and using it as a material in bookbinding. There are numerous libraries throughout the world that have examples in their restricted collections, usually requiring special permission to even see, with handling them being strictly forbidden.
Except, for the most part, they actually... don't. Though there are some genuine examples, over the past decade or so quite a few of these bindings have been tested, and the majority are fake. Usually they're some other kind of leather (turns out that giving a macabre backstory to your book bound in horsehide ups the resale value a bit) or, in some cases, they're actually not even leather at all.
Anyway, the thing I'm getting at here is that there's a decent chance that 20, 30 years down the road when our human leather enthusiast salaryman retires and tries to sell his anthropodermic bag that the buyer will take a look at it and, while he's halfway through explaining the elaborate washing ritual, interrupt him with "Dude, this bag is made of vinyl."