Not sure about the inflatable bars, but we bought an almost new Exodus (halfords) roof box off Gumtree with bars from here we went with the Cruz brand and they're brilliant think they were £65 ish V reasonably priced with quick delivery.
We can't afford to get roof bars fitted, just wondering if anyone had tried this inflatable roof rack and 360 ltr hold all? and if it is any good? We have another dc on the way and am not sure how we are going to for everything in on our next camping trip! Thank you!