They used to be durable but honestly not any more. I am dealing with two cracked bags at the moment. The cabin hybrid with two external pockets has been my primary bag for 5 years and I fly a lot. United 1 K to be specific. I mostly carry it on but have on occasion had to check it and two weeks ago it got a very bad crack near the wheel well. United is replacing it but the wait time is long because of supply issues. So I hauled out the regular cabin bag, non pocket version, to use last week and discovered two cracks. No clue when it happened as the bag has seen very light use the past 4 years. Pervious models of Rimowa bought 20 years ago never had these issues. I think the quality of their polycarbonate material has been downgraded. I am looking for another brand now. I can't spend this much money on a product that can't hold up. Very disappointed.