Okay I haven’t actually traveled with this bag yet. I have used travel backpacks for long haul travel, but nothing like this with the vacuum seal. In the picture the bag isn’t fully extended and I was able to pack a lot in there. In April I plan on going on a long haul trip overseas, and I’m tired of bringing my suitcase all the time. Trying out minimalist travel. Went to Korea 2 years ago and I brought a travel backpack and a carryon suitcase. Now, Korea has a lot of stairs, and long tall stairs at that ?. So that’s why I want to just do a backpack. With this, I can pack about 20 different articles of clothing. It holds a lot and it’s strong and comfortable. With how much I plan on putting in there, I don’t feel like it’ll break the zipper at all. I trust its build. It’s not really heavy for when you are standing a while or going up those long stairs. I fly for work and I fully believe if you have to, you can put this bag under the seat in front of you. I’m excited to try it out and let you all know how it goes!If you aren’t sure, trust the reviews, they are right! ?