Originally Posted by kydsid

Has to be a purely economic reason. There is no real reason otherwise. It can go on aircraft, but cargo aircraft only, not passenger. As for crossing the border there is no restriction, just red tape in shipping a hazmat material, which is the same for any butane fuel being shipped (I can fully understand why a US retailer would not want to ship it to Canada due to the paperwork alone though). Sounds like you might have found a profittable side gig.