What pocket is the back pocket of a backpack?

The back pocket of a backpack is the pocket on the "top" of the backpack if you were to lay the pack on the ground with the arm straps underneath it. A fallacy among many females (because of their inferior sense of spacial reasoning.. that's science) is that this pocket is actually referred to as the "front pocket". This of course is incorrect as the "front pocket" is actually synonomous with the "main pouch" of the backpack and is closest to the body when the pack is being worn.