I almost got screwed because of my carry on lugage. Iceland air limits carry on to 13lb. I am guessing by how little is left in my carryon bag it must way about 4lbs on its own. Serves me right for buying a sturdy carry on bad. so on the way back I am checking it and using a light backback I have instead. Now here is the screwed up part, if I way 180lbs and the guy behind me ways 200lbs why can’t I count that 20 difference towards my carry on or check luggage limit. I ended up steeling some of hy’s luggage limit