Credit goes to remivcr on ig

https://www.instagram.com/remivcr..

It's his profile and he's a wildlife photographer. You can check his profile.

And in this video it's a baby sand Cat.

I saw this on a car at a red light. It looks like an IV bag with the line going into the gas tank. I thought maybe it’s being used for a fuel additive, but all the additives I’ve seen you just empty directly into the tank.
Should have flagged the driver down to ask WTH it was… Any idea, Reddit?