This is the best backpack I have ever purchased for international trips not necessarily for hiking. I went on a long international trip with my daughter and this won't fit under the seat in front of you but it does fit in the overhead bin. I love that it opens like a suitcase but you can wear on your back. It is perfect for navigating tough airports in foreign countries especially if you're holding the hand of a smaller child and/ or need/want your hands free! Perfect if you are entering in and out of train subway or bus stations and need to make quick transfers its awesome to be able to have most of what is valuable to you on your back. I also filled it to the brim and it was super comfortable on my 160 pound frame I am 5 6.
A really comfortable backpack that holds a lot of items. I highly recommend this. It may not be enough for a longer trip if it is your only bag but it is great as a secondary bag that holds a lot of stuff.