Two French hotel (camp), Attrape Reves in Bouches-du-Rhone (near Marseille) and Sky River near Loir-et-Cher, are the places where you can sleep under the stars. Concept of sleeping in balloons are designed by French designer wanting to create an environmentally friendly space: when a plastic bubble pack, the area remains almost intact. Balloons are small and cozy, their diameter is about four meters. Some are completely transparent, while others provide a little more privacy.