When I say this thing is built like a tank, I mean it- it feels like it will outlive not only me but probably my kids too. There's lots of room for whatever you decide to put in there ( for me, I've got a 15.6 inch laptop, some textbooks, and some notebooks). The downsides to this product are the weight and the Velcro feature. This thing is tough as nails, for better and for worse- due to the weight of the bag itself I couldn't see myself wearing it for long periods of time like on a hike or something, but for more casual applications like transporting textbooks for school or using it for the office, this bag is everything you'd need and then some. Another gripe I have with the bag is the extremely loud Velcro enclosure on the front. Yes, it 100% does its job in holding things in and protecting them, but every time I open the compartment up it feels like I'm disturbing everyone within a mile radius (an exaggeration, but geez this thing is loud.) If you worked in a sound sensitive environment, look elsewhere for a bag.