used one bag on vueling which accepts 55 x 40 x 20. it goes quiet in the locker because very flexible. shek once in the past, one can even get rid of his jacket and put it in the boot which made for 20 to 25 cms. enough capacity for a week of vacation provided you do not go to Greenland and not wanting to bring back memories for the whole family. Full of fashion clothing 20 cm thick, it displays 8.9 kgs on the scale (vueling limited to 10 kg). The telescopic handle for pulling the bag is convenient, but does not seem very solid (I assure you it has not broken), but in my opinion it important not to brutalize. the wheels are practical but small so avoid tow on the ventilation grilles at the risk of getting stuck ... in an ideal conclusion for a week in the sun if the manipulated carefully. Now, we must see the strength in time (it does not seem to have suffered from that first trip). I therefore advise in hand luggage, but I think too fragile to travel in the hold.