While in Germany the other day (I am doing Europe in 5 days), I picked-up a cargo cover. The rollershade type kind, which you pull out to cover-up whatever you have got in the trunk. What I liked about it is that it also has a very long flap which attached to the carpet in the "trunk" area by means of a long Velcro strip, so as to keep items from sliding around and falling behind the seats. The cost for the cover was 98 Euros.