I have owned my bottles since the mid 70's. I used to have to pay the local supply a fee to ship the and get the refilled. at that time there where or 4 lws, but none filled their own tanks. Over time, the little shops closed out, retired or owners died. On company bought everybody else and ended up with all kinds of names on their bottles. I made a deal with the owner of the supply house to swap my bottles for his so I wouldnt have to have them send off to be filled every time I needed gas. I paid him something, but dont remember how much. Now, all my bottles have his company name on them, my original bottles who knows where they are. This has worked pretty well for me over the years, I need gas, I just swap for new ones. Last time I needed gas, they charged me for a inspection because one of their bottles had expired while I had it. Kind of pissed me off because it was one of his bottles that had expired. I complained, to no avail, but when you consider I havent had to pay for an inspection in probably 40 years, I cant really complain. I did tell him that the next time he tried to charge me for an inspection on one of his bottles, I could find somewhere else to buy my gas. Probably not a very good threat considering I wont get more than one or two refills per year. I aint exactly his biggest customer. If I do have to swap suppliers, I intend to keep the bottles unless he can give back the ones I traded him. I also kept the receipt showing I paid for an inspection, and from now own will check the expiration date on the bottle they are swappin me. I aint taking another bottle that is close to inspection date.