I have already gone through this question about empty suitcases. However, it does not address protecting the suitcases from possible damage. My friend (who is a foreign student studying in Germany) would like to take 2 empty large suitcases to India so that he can bring them back filled up when he returns. However, he feels the suitcases might get damaged when he checks them in empty while travelling from Germany. I know airlines usually have no problem taking empty suitcases, but I would like to know methods for protecting the suitcases when they are empty. The suitcases cannot be placed one inside the other. Is it a good idea to wrap them at the airport or something along those lines?
How can I protect empty (close to empty) suitcases from damage?