Ankle Flask – Does anyone know where to get/or recommend?

As the title says, I’m looking to find something that can hold/strap a flask just above the ankle. I didn’t find anything on Amazon. Some sort of holster.

Does anyone have a good idea or where to acquire one of these? (Obviously tape is a last ditch effort)

I got this idea off some show, and I was like “hmmm 🤔” I want one. For professional reasons.