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Perfect airline free carry on!
I have been testing this backpack and I have also a similar one from Samsonite, I must say, they roll so smoothly that even if its heavy you do not feel it. Te best thing? it fits under your sit so you do not pay for extra luggage. I traveled with it in low cost airlines and had no trouble at all. If someone tries to say something just put it on your back for a few minutes and you are good to go. I have fit in everything for a comfortable week trip!