Travelers Choice Tasmania Three-Piece Luggage Set, Black 100% Pure Polycarbonate allows the shell to absorb impact by flexing when under stress Interior lid with U zip mesh cover and tie-tapes to secure belongings Convenient add-a-bag strap for carrying additional bags Expansion gusset offers 25% more packing capacity Dual spinner wheels provide smooth and quiet 360 degree maneuverability Measurements : 21-Inch ( 21-Inch H x 14.5-Inch W x 9-Inch D Expands to 11-Inch D) , 25-Inch ( 25-Inch H x 17-Inch W x 10-Inch D Expands to 12-Inch D) and 29-Inch ( 29-Inch H x 19.5-Inch W x 11-Inch D Expands to 13-Inch D )