I have the topcase V purchased directly from Embags, I have not found here at Amazon and only a few centimeters thicker than the top case IV. Was very well double bagged after 2 days. The Embags replaced me a narrower aluminum case from Dicota, which was nice, but (damaged feet, pressed from below suitcase, bent the frame) a total loss after falling from a height of approximately 0.5 m. I believe that the lack of robustness is a general problem of aluminum cases, on the other hand I do not have the same easy and respectable alternative. And because this is a material problem, I do not think that even more expensive suitcase would be better. Otherwise the Alukoffermarkt is here at Amazon yes dominated by cheaper Alumaxx, but I found ugly, and especially the locks are securely less robust than the Embags (the Dicota I had the same, but never completed). A little müffelt the plastic inner life that looks better in reality than in the photos, but it still goes.
