What's inside an Iron Republic Safe-Conduct Jar?

I have managed to get one of them, and I intend to use it someday… Tho, I have to ask, what exactly is INSIDE the container, and what makes it so useful for approaching the Iron Republic somewhat more safely? Why do I even need it?

Oh the answer to that is quite simple. Because-hey look over there, it’s literally anything else!

(Aka its a mystery, maybe nothing and you got scammed)

Nobody who’s opened it has ever made it out of the Iron Republic, so who knows? (Note: not canon, but entirely probable)

Your hopes and dreams, I’d say. Keep them safe in a bottle, away from the Republic’s hands. (Not canon either, sorry!)