Description Measurement: 20 inch (21 x 8.5 x 15) Capacity: 20in 38L Weight: 20in 6.38lbs Travel days: 20in 1~4 days 24inch (24.5 x 10 x 17) Capacity: 24in 60L Weight: 24in 7.89lbs Travel days: 24in 4~7days 28inch (29 x 11x 20.5)(13.5in when it is expandable) Capacity: 28in 93L(110L when it is expandable) Weight: 28in 10.88lbs Travel days: 28in 7~9days Carry on Luggage is made by ABS& PC brushed surface layer, which is wear-resistant, scratch-resistant, waterproof and high temperature resistant,as well as easy to clean. The 8-spinner wheels system allows smooth 360 degree movement over any bumpy road for complete mobility free-weight rolling without any deformation.Moreover,the wheels are detachable so we can easily replace them.(Welcome to contact us via Amazon for a new replacement.) TSA lock which only allows TSA agents to inspect your suitcase without damaging the lock. If you have some inquiry about how to open and reset the TSA lock, please fell free to contact with our customer services Double Explosion-proof Zipper to offer better protection for your stuffs in luggage during traveling, they won't be pierced by sharp tools; Making packing clothes easy with fully lined interior and the multi-use organizational pockets. Three Different Sizes Luggage Available: 20 inch (21 x 8.5 x 15, 38L/ 1-4days), 24 inch (17 x 10 x 24.5, 60L/4-7days) 28 inch (20.5 x 11x 29, 93L/7-9days).Please note that ONLY 28in(110L when it is expandable) is expandable, adding 15 percent to the scalable space.