Hardshell exterior is designed to be waterproof for all your rainy travels. Hardshell construction is designed to absorb impact. Retractable handle system allows you to maneuver your bag with ease. Top and side grab handles are designed to make lifting easy and convenient. 360-degree spinner wheels allow smooth and effortless mobility. Recessed handle and wheels to maximize the carrying capacity while meeting FFA size requirements. Built-in USB port on the 21” carry-on with an interior power bank compartment provide quick connection to your portable electronic device for a quick charge. Power bank is not included. 30” Spinner’s Exterior and Interior Dimensions: 29. 5”H x 19. 25”W x 12”D (9. 23 lbs. ) and 27”H x 18. 75”W x 11. 5”D. 26” Spinner’s Exterior and Interior Dimensions: 25. 5”H x 17. 25”W x 10. 75”D (7. 82 lbs. ) and 23” H x 16. 75”W x 10. 25”D. 22” Spinner’s Exterior and Interior Dimensions: 21. 5”H x 14. 25”W x 9. 5”D (6. 48 lbs. ) and 19”H x 13. 75”W x 9”D.