it luggage Duraliton Apollo 21.3 Inch Carry On, Nine Iron, One Size This 21.3 inch 8 wheel carry on features duraliton, an exclusive material that is both ultra-strong and lightweight The carry-on exterior measures 21.3 x 15.7 x 8.5 inch + 2.5 inch expander. Interior measures 19.3 x 15.4 x 8.5 inch + 2.5 inch expander and weighs 6.17lbs 15.7" x 8.5" + 2.5" Exp x 21.3"