A suitcase is like the portrait in the traveller’s attic, accumulating more than its fair share of knocks and scrapes while we refresh ourselves on the road. We trundle them over cobbles, see them tumble from luggage racks on the train – and if we choose to fly, there’s a fair chance they’ll be mishandled before we reunite at the carousel. For our testing, we pushed eight suitcases to the limit by dropping them on to a hard surface, as if they’d been fumbled by a baggage handler. Air travel is especially tough on suitcases, so you might get away with choosing a less-resilient case if you make the climate-conscious choice to travel by rail or sea. According to one Gatwick worker interviewed by the Guardian , the average baggage handler has to load about 150 bags within 40 minutes to facilitate every landing or takeoff – and that’s one of several stints of intense effort during a shift. It’s only natural, then, that some suitcases are roughly handled or dropped.…