Question: Carry a propane tank without it rolling around in your vehicle.
Options:
Put the empty propane bottle into a bag. Hang the bag on your clothing hook. That will keep it stable instead of rolling around the car.
Put the empty propane bottle into a milk crate. The milk crate will keep it stable instead of rolling around the car.
Answer: Put the empty propane bottle into a milk crate. The milk crate will keep it stable instead of rolling around the car.