a 4 wheeled bag is a pleasure, you do lose a little in packing space but to be able to walk it instead of tow it is great, I originally had a cabin size and a 26inch, even stuffed as full as it would go I never made it over 17kg, I went back yesterday to buy the 29 inch 3 months after the original purchase, unless seriously stuffed it doesnt get much over the 25kg