O.K., so earlier today, I ordered one of these
https://www.aliexpress.com/item/1005003540380862.html?spm=a2g0o.9042311.0.0.4bba4c4dD82eBN
I'm not expecting much in terms of build quality, as it cost only a whopping $9.50USD (including shipping), and it's of plastic construction. Guessing I won't receive for quite some time.
Knowing myself, before I even get it, I'll relent and pony-up the ~$120USD for the Horizn Studios bag pictured in the OP, hahahaha. I have scoured the interwebs, and the cheap one from AE is the only thing I can find that's close to the Horizn Studios product.
I'd still prefer something a bit smaller, but, it's clear there simply is not enough demand for such a bag as I can't find anything else.