Quite to the hype as the previous speakers, I can not jump. That the backpack is large and relevant subjects has, is already clear, but to me he does not have enough partitioned compartments, - the extreme left and right are none. For a notebook with 17 inches, which is kept inside only with a rubber band, I could squeeze in a second notebook of the same size. In the second extra large compartment fits more precisely a 15-inch notebook. It also includes a small zippered pocket of about 12 cm by 15 cm and two similarly large mesh pockets that are open and not closed up. Outside are two zipper pockets. The top of about 19 cm by 15 cm has inside a network with Velcro and against a diagonally placed open purse "in the fit some pins. But you should not be too long, otherwise leaves the zipper does not close, or ground tears if necessary on the bottom. The second outer pocket underneath is 30 cm by 20 cm, which provides enough space for a power supply of various cables and other odds and ends. The comfort is pleasant, like the overall impression. What the two hook and outer loops are, I have not yet figured out. I know that the BacPac is intended for notebooks, but here it was in my opinion, assembled only at random, because meaningful subjects are missing. Why I have not returned it, is: My daughter has the same part in the 15.4-inch version with much better facilities for four years and it strained to the utmost, and I thought many times, equal to tear the seams. But for me the BacPac is used only as a notebook bag, for which it is intended.