I have a lot of experience using and also hearing first hand accounts about briefcases and cargo bags.
Rimowa are how u say "looks good and not good to eat" not exactly durable cheap. Just ask any authorised multi brand servicing agent. This includes the soft and hard aluminium cases.
U wan something really durable, that can be thrown around? Try Zero Haliburton. Unofficial choice of the US government. Rumour has it that it is good enough to house the atomic football.
But be forewarned, those ZH are heavy. So it might eat into your travel loads allowance. Also if you carry one of those aluminum briefcases, you'll automatically be a target of mugging and theft cause ppl watch too much movies.