Apart from the SGS branding/logo is there any thing on the bottle to show the original shop you got it from ? Just wonder if another supplier of SGS (say the cheapest one of the four) would be fussy about exchanging it. Also would any of the others give you your deposit back when you no longer need the bottle as the receipt you have would I guess be from the original supplier of bottle. What happens to your deposit if the original shop goes out of business ?
The only issue you may get with taking a cylinder back to a different distributor for refund or even refill is that many of the distributors use computerized accounts packages that require an invoice number to be able to raise a credit, this can apply to refills but there is usually a way around the issue if you contact us.
The deposits are all held by us so in the event that a distributor goes out of business we can refund the deposit if you are unable to get a refund or refill elsewhere.