The shape of Mazda’s trunk is quite appropriate. You may always put small shopping things in 626 trunk. You can usually get more than 455 liters by putting down back seat in 626. These numbers were made by Mazda in 2001 models during composing. It’s possible to arrange 518 liters of things in Mazda 626 cargo space.
Otherwise you can cause great problems for Mazda 626 by loading it. Check also if your luggage in 2000 Mazda isn’t heavier than needed. The 518 liters of free space proves to be optimum in this Mazda’s model.