We get up relatively early today and ask at the campsite reception how the check-out actually works. We might want to leave around 1 pm, exactly during the lunch break of the site. And during that time, the barrier is closed. We are given a green card with which we can open it on departure. And we even get a refund on the late checkout fees because we leave so early. That's really nice! We reinvest part of the money to buy two baguettes which are still lying around at the reception - our breakfast for today.
We abandon the idea of going back to the Luxembourg city for shopping. The effort seems to be too high. Also, the city is quite nice but we were not really excited. So we quickly put away all of our luggage and set off on the journey to our last station near Saarbrücken. About 130km from here. Bye bye Luxembourg!