This back-pack has more hidden compartments than we think we'll ever use, but it doesn't seem at all to take away from its versatility and spaciousness.  Works great for our middle-schooler.  The construction is solid: the stitching is tough, the materials used are tough, the zippers are of good, tough quality -- yet the backpack looks and feels sleek as well.  One can tell by hefting it when absolutely stuffed that it will hold with no problem.  The handle at the top is a great feature.  Very good design, both functionally and in form.