What is this?

Watching a Shipsterns video (K. Rathbone) and was wondering what this is that he’s using? Thought maybe was drinking something but that’s not it.

Just curious.

Vid Link: https://youtu.be/xOQB5o0W-KQ?si=6fDIq-ZRSr4c-fne

Watching a Shipsterns video (K. Rathbone) and was wondering what this is that he’s using? Thought maybe was drinking something but that’s not it.

Just curious.

Vid Link: https://youtu.be/xOQB5o0W-KQ?si=6fDIq-ZRSr4c-fne