This is a great backpack for its longevity, quality build, size, and design.-Build/Longevity: I have owned this backpack for three years. In those three years I have used this backpack everyday to go to and from school (five days a week with a laptop and books in it), for hiking, and for travel. I travel a lot and use budget airlines, which means carry-on and no checked luggage (to save money). This thing has survived the clothes, toiletries, books, electronics, and the rigors of air travel (being stuffed under seats, in the overhead, in trunks, out in the woods, etc.).-Size/Design: I own a 17.3 inch laptop (Vaio VPCF2290x) and it fits with room to spare. The pockets are great for storing many different types of things: books, clothes, groceries, tools, etc.-Quality: I have put this backpack through its paces and it has never let me down. Heavy loads, outdoors (hiking, beach, etc.), planes, and so on. This thing laughs at 5 liters of liquid (I had to carry groceries in this).-Comfort: the pads on the back are a nice touch and the straps don't dig into your shoulders even when fully loaded.-Self-Repair: After three years you would expect things to experience some wear and tear. There are only three parts of this backpack that have experienced significant wear and tear and it was negligible on it doing its job. I have included pictures: the plastic part of the handle broke in two; part of the seam came undone on one of the straps; It came apart where two parts are joined on one of the straps. It was an easy repair job: needle and thread.Overall this is a very durable backpack and I would highly recommend it.