Let's cut to the chase - this is a solid, well designed backpack that rocks. I researched a ton of backpacks that have a structured exterior style and after owning this one for about a year, it has not disappointed. I don't write a ton a reviews but feel I had to on this one.
It wears well for a tall guy and it has a padded back that makes it comfortable for wearing a long period of time. You can really fit a lot of stuff into 4 zippered areas. I was concerned the 30L would be too big for under the airplane seat in front of you, but this has been the best aspect fo the bag. It fits under the seat perfectly and when you pull it out to access items, all 4 zippers are easily accessible. Also the water bottle sleeve on the side and wallet/keys sleeve on the other side are pretty handy.
And lastly, yes...it is durable. I wore it at Disney with all my family's stuff (4 water bottles, ponchos, spray fan, snacks, change of kid clothes, cell phone chargers, etc) and when I loaded onto the Space Mountain ride, I put it between my legs figuring it would be fine. About halfway through, a sharp dip and tight turn, and that sucker flew right out! I definitely heard it hit some metal bars or some sort of scaffolding. Not a good feeling to lose it, but they found it the next day and when I picked it up from lost and found, no scratches, and all items inside were intact. Pretty good stress test!