Laptop backpack...

[Waffles]

the swissgear stuff is great. In most of the models there is a dedicated, padded, pouch that holds it. After using it everyday for uni, my computer has only suffered from wear and tear while in use, never from being inside the backpack. If you want it to be very protected, consider buying a padded sleeve for the laptop itself and then add it to the backpack. Your laptop will sleep like a baby.