The bag is well made high, a 17.3-inch laptop fits so geradfe purely that there is no room at the side. However, for power supply unit is in the front pocket is not really space taken ganauer is the optional tray too shallow so that a cube-shaped power supply must be dare Inge squeezed, which naturally a pressure on my laptop verursacht- is not at all. !!!! Therefore, unfortunately, back, and only 3 *. For people have a very flat power supply is the bag completely ok.