28 Upright: 28 x 21.5 x 12, 13.5 pounds * 24 Upright: 24 x 17.5 x 11, 12.5 pounds * 20 Rolling Upright: 20 x 15 x 9, 9.5 pounds * Lightweight durable Polycarbonate ABS shell material for strength and providing maximum impact resistance * The Polycarbonate allows the shell to absorb impact by "flexing" when under heavy stress