Large boxes exceed UPS Drop Box size limitations and should be taken to a staffed retail location. Search for a location near you that accepts this item. Item Number. Large-010195106, Medium-01019510605, Small-01019510603. Item Size. Large-18in. x 13in. x 3in., Medium-16in. x 11in. x 3in., Small- 13in. x 11in. x 2in.*.