One thing I should note about the 1lb refillable bottles is that it's useful to have a system to quickly know how much is left. When I get them I put two small pieces of blue tape on the lid, then when I start using the tank I remove one piece, and when it's empty I remove the other piece. This way when I leave on a trip I don't end up grabbing a bunch of 1/2 used tanks and it makes it easy to remember which I need to exchange.