There are two problems with "just checking it:" First, fuel canisters aren't allowed in even checked baggage (with good reason!). I think that this applies to flammable alcohol as well. Second, I've had to wait a day or more to retrieve lost checked bags more than once over the years. It's a minor inconvenience if you are staying near the airport. It would be a disaster if you're flying into Las Vegas with a Grand Canyon permit starting the following night.