US Patent 7509699 Leveling camping pad

An apparatus for placement under a sleeping bag useful in leveling or controlling the attitude of the sleeping bag includes a plurality of chambers, some of which extend along a longitudinal length of the leveling camping pad with respect to each other, and wherein some of which are adjacent to each other and extend along a width of the apparatus, and wherein the width is perpendicular with respect to the length, and wherein at least four of the plurality of chambers include a valve for adding or removing air from each of the chambers without affecting a quantity of air in the remaining chambers. A preferred modification includes a continuous upper chamber that extends over the plurality of chambers.