I would double check those weights. I know of no Delsey Helium that weighs less than 8.5 lbs (= 3.9 kg), and that's for the 18" (= 46 cm) size.
Originally Posted by LapLap
Aha! 2.5 kgs for the 50cm cabin case and 4.2 kgs for the 70cm hold case. That's looking very interesting. Thank you both for the pointer and recommendation!