601.86  Standard field boxes for fresh citrus fruit.--All field boxes used in the purchase, sale, or handling of citrus fruit from or for the grower by a citrus fruit dealer in the state shall be of the uniform standard size of 31¹/₂ inches long, 13 inches high, and 12 inches wide, inside measurements, and shall be divided into two compartments by a center partition of at least three-fourths inch thickness; and each of these compartments thus created shall have a cubical capacity of not to exceed 2,400 cubic inches.