Patent ID: 8006630

Claim:
A structure constructed from blow-molded plastic that includes a hollow interior portion formed during the blow-molding process, the blow-molded plastic structure comprising: a first surface; a second surface that is spaced apart from the first surface, the first surface and the second surface enclosing at least a portion of the hollow interior portion formed during the blow-molding process; an average thickness measured from the first surface to the second surface; and a plurality of depressions integrally formed in the second surface and extending towards the first surface, at least a majority of the plurality of depressions being disposed in a pattern, the depressions in the pattern having a generally uniform configuration, the pattern of depressions covering at least a majority of the second surface, the pattern of depressions including at least one row and at least one column, each depression in each row of depressions being spaced apart from an adjacent depression in the row of depressions by an average distance that is generally equal to or less than three times the average thickness, each depression in each column of depressions being spaced apart from an adjacent depression in the column of depressions by an average distance that is generally equal to or less than three times the average thickness.