...and it is the most solid, rugged bag I've ever had the privilege to own. I am only now replacing it, and that's not because it broke. It has fit perfectly on every bus, train, and plane I've ever been on, is impervious to weather, and holds my work wares perfectly. The ONLY things I have to say that aren't in its favor is that it is hot in summer and leaves black stains on my ass in certain weather, which is a natural consequence of the materials that give it such durability.
I had to live out of this bag for two months and it has carried countless loads of my wares over the years. Given a choice I will never have another kind of backpack.