I used this bag for the first time today The weight distribution is great and it does not bother my back. It has 4 compartments plus 2 side nets that zipper. I had to carry a large amount of things with me to work today including my laptop and it held everything and I could have fit much more. I have a 13 inch mac with a cover on it, I have no idea what other size laptops it holds? I bought the blue and black and the colors are very nice.