Duffel tnf Basecamp taille S en backpack

Hey guys, I'm planning to go for a long trip abroad by backpacking. I currently own a trekking back by Decathlon (the 50 + 10L MT900 Symbium) but I'm wondering if it wouldn't be better to get a TNF basecamp S since it cans be a carry on luggage (at least according to the brand). So I would love to have your feedbacks about the comfort, the solidity and of course if it's accepted as a carry on luggage. If any of you use or used one of these bags during long trips, I'd love to have your opinions ! thanks guys