Comicbook.com drew our attention to this clip which has apparently gone viral. This was from a behind the scenes shared on HBOMax. Hopefully these HBO BTS’s make the 4K|Steelbook versions.
As you can see, Robert Pattinson used the Utility Belt on his Batman costume as a storage pouch for his Juul vape pen! The days were long shooting this film (even the final runtime was about three hours!) and as a smoker, Pattinson made efficient use of his Utility Belt by pulling this move. It’s a hilarious little anecdotal detail – the exact sort that will help cement Robert Pattinson’s legacy as Batman.
I had no idea what a Juul was. Unexpected use of a Batman utility belt, that's for sure!