Instant purchase welcome! Carry-on Suitcase, S Size, with Expansion Function, Brake Casters, TSA Lock, 40L, Carry-on Case, Business Trip, Travel, 1-3 Nights Color: Black Size: S Size / Carry-on / 1-3 Nights / 40L (55.5*36.5*23cm) [Expansion Function for Flights & 3-Stage Adjustable Caliber] Designed for in-flight movement, business trips, and travel, it features a zipper-opening expansion structure. By expanding the gusset by about 5cm, the capacity increases by about 20%, so you can rest assured even if your luggage or souvenirs increase during your trip. The lightweight and durable aluminum alloy caliber can be adjusted in 3 stages with a one-push operation to suit your height and usage scenario. [Dry and Wet Separation Storage, Hanging Storage, Dust Cover Included] Equipped with a dry and wet separation bag that allows you to store wet and dry items separately. Inside, there are also convenient pockets for temporarily storing small items, smartphones, documents, tickets, etc. A dust cover with dustproof specifications is included, which can be folded and stored when not in use. [Removable, Double Casters with Brakes] Durable double-wheel casters are used, providing smooth 360-degree rotation for comfortable travel. The design suppresses vibrations and noise during travel, allowing for stable movement even on uneven surfaces. With the brake function, you can rest assured on trains and slopes. The casters are removable, making cleaning, storage, and replacement easy. [Highly Durable Hard Body & YKK Zippers] The hard-type body combines ABS resin and PC (polycarbonate) resin, achieving both lightness and impact resistance. The main zipper uses reliable YKK zippers, providing a long-lasting and stable user experience. jack45