My mum has some old , old suitcases ( her Grand mothers's ) , some are leather with square brass corner fittings and locks , some more like a cover of a hardcover book , with wood trim around the edges , and another that looks like it would mush all up if you got it wet , some kind of paste board covered in patterned paper . Might be a class thing , leather for the gentry , paste board for the lower classes? She's got a dozen or so Steamer Trunks with the same kind of variations , again maybe a class thing .