Why would one want to pay hundreds of EUR/USD/GBP (pick your favorite) when a regular big air travel case (not the huge ones) fits perfectly, leaving room for a full laptop/camera backpack and 1 or 2 purses? I travel with a Samsonite Spinner, the 75/28 size I think + a big camera backpack and small etcetera's (like wife's purse, a bag of road snacks and drinks and the like), with the roof down and wallet intact. Maybe it doesn't use the boot space as efficiently as the specially created bags, but I can't complain with my choice.