Thule offers with its 4 pockets for the roof box at a very good solution to store objects quickly and to, for example, found later at the resort quickly. I have the bags sold after a trial again, as we indeed longer with stable bags for loading, - need and unloading. These can be in the roof box but move more and felt fit more things in the box. But who does not trip with a family of four and the box does not have to completely fill the pockets can certainly make good use of.