【Carry-on Compatible for Comfortable Travel】This S-size suitcase (approx. 53 x 35 x 24cm / +5cm when expanded) is a carry-on case that meets the size requirements of many airlines, with a total size within 115cm. The capacity is 40L normally, and 49L when expanded, allowing for ample storage despite its compact size, making it perfect for short trips and business trips. *Carry-on size standards vary by airline. Please check the official website of your airline. 【360° Rotating Silent Casters & Detachable Design】Silent double casters provide smooth movement, rotating 360° freely, allowing for stress-free operation even in crowded airports or narrow aisles. The casters are detachable, making replacement and maintenance easy, ensuring this carry case can be used for a long time. 【3-Stage Adjustable Carry Bar & Luggage-Securing Belts】The carry bar can be adjusted to three different lengths to suit your height and usage scenario. Furthermore, the interior is equipped with belts to securely hold your luggage, preventing items from shifting during travel. This suitcase is designed for easy access to your essential items, making it very user-friendly. 【TSA Lock & Double Zipper for Peace of Mind】Equipped with a TSA lock for peace of mind when traveling abroad. The double zipper design prevents unauthorized opening from the outside, enhancing security. This carry case allows you to safely check your important luggage and is suitable for a wide range of uses, from business to leisure. 【Lightweight PC+ABS Material & User-Friendly Interior】Made of lightweight and durable PC+ABS material, reducing the burden during long trips and overseas business trips. The interior features dividers and pockets for easy organization of small items, and X-shaped belts to prevent clothes from shifting. Its compact yet functional structure supports a more comfortable journey. 【1-Year Warranty & After-Sales Service】We will promptly address any damage or defects within 30 days of product arrival. Returns and exchanges are also available, providing peace of mind for those purchasing a suitcase for the first time. Please be sure to check the size before ordering and make your selection with confidence.