Patent ID: 8342107

Claim:
A structure constructed from blow-molded plastic having a generally planar configuration and a hollow interior portion formed during the blow-molding process, the blow-molded plastic structure comprising: a first outer wall; a second outer wall that is disposed generally parallel to the first outer wall, the first outer wall and the second outer wall at least partially enclosing the hollow interior portion formed during the blow-molding process; and a plurality of depressions integrally formed in the second outer wall and extending towards the first outer wall, the plurality of depressions, the first outer wall and the second outer wall being integrally formed as part of a unitary, one-piece construction, at least a majority of the plurality of depressions being disposed in a pattern, the pattern of depressions covering at least a majority of the second outer wall, the pattern of depressions comprising: at least one row of depressions, each row of depressions including at least five depressions, each depression in each row of depressions being spaced apart from an adjacent depression in the row of depressions by a distance that is generally equal to or less than three times an average distance separating the first outer wall and the second outer wall; and at least one column of depressions, each column of depressions including at least five depressions, each depression in each column of depressions being spaced apart from an adjacent depression in the column of depressions by a distance that is generally equal to or less than three times the average distance separating the first outer wall and the second outer wall.