But which suitcase is toughest? And how much do you need to pay out for one that’s going to last? We bought hard shell suitcases from Samsonite, American Tourister, Tripp and more at prices from £30 to £180 and put them through a series of tough tests to find out. We discovered: Although the most durable suitcases are likely to cost you more money, you don’t have to shell out more to get a...