The Top-loading Ortho Model Archive System offers 80 ortho model storage compartments in one compact chest. Lid lifts off to four stacked divided trays of 20 compartments each. 3 1/2" x 3" x 3 1/4"D compartments accommodate one model set. Outer box measures 18 1/2"W x 13"D x 15 3/4"H. Outer box may be numbered and stacked for the ultimate model storage and retrieval system. Corrugated card-board construction. Simple assembly required. Four complete boxes per case, 320 compartments total!