That's the ones! Just the ticket to keep in the car for swarms I would think.
The only problem I see with that idea is the box looks a little flimsy. Looks like the bees could easily get loose. Thousands of bee loose in 1500kg of metal flying down the road at 60km/h may be a prescription for a problem.
You may already do this, but I carry a head net with me during swarm season just in case. I wear it if a get lucky.