The backpack seems big enough to hold my son's books. The bag is not yet used so I can't speak of the durability. Quality seems ok from what the eyes can see.
I love this bag! The bag is a great size for my son (roughly 50th percentile for an 8 year old) and he loves the way the compartments are divided up. It's spacious and well-organized, and of course he loves it for the design. It seems well-made and is all loaded up with his back-to-school items with no signs of distress to the bag. It is a great value in my price comparisons.