@barliman2001 Other than the color, the Thomann looks exactly like a Dillon. I think it's from the same Chinese manufacturer. When I travel, my Dillon case fits inside my carry-on luggage, along with a small practice mute, my laptop, and miscellaneous other things. The combination is not light, thanks to the laptop, but it is compact.
The only thing smaller than a pocket trumpet is a hose trumpet, but intonation suffers, you have no valves to practice with, and no matter how much the hose is cleaned, mold seems to love the environment inside.