The expansion feature is useful when you need to bring souvenirs or extra luggage during your trip. Simply unzip the zipper to increase the capacity by approximately 5-10cm (15-20%) , allowing for flexible storage.

For example, it is useful when traveling abroad and needing more luggage on the way back, or when packing seasonal clothing (such as winter clothes). However, please note that after expansion, the bag will often exceed the carry-on size, so it will have to be checked in.

Casters with stoppers are useful when you want to secure your suitcase on a slope or on a train or bus.

This feature is especially popular with travelers who frequently use public transportation and those who travel a lot with lots of luggage, as it stabilizes your luggage and prevents it from moving around on its own, reducing stress in crowded places and while traveling.

Suitcases with USB ports allow you to connect a mobile battery (sold separately) inside and charge your smartphone or tablet from the external USB port.

Simply place the battery in the dedicated pocket and connect the cable to the port. This allows you to charge at the airport or while traveling without having to drag a cable, making it especially convenient for business trips or long journeys.

TSA locks are especially important when traveling to the United States (including Hawaii, Guam, and Saipan). The TSA (Transportation Security Administration) can open the lock with a special tool during airport security checks, so you don't have to worry about the lock being broken.

Combination locks are convenient because there's no risk of losing your key. They're increasingly being used at international airports outside the US, so this is a recommended feature for people who travel abroad frequently.

The hooks are convenient for hanging small items like handbags and hats, leaving your hands free. The cup holders are perfect for placing coffee or water bottles, making it easy to move around airports and train stations.

These features are especially useful when traveling with lots of luggage or children, and the detachable or foldable design makes it sleek when not in use.

Prioritize your travel style:

Short trips and business trips : Carry-on size + TSA lock + PC pocket.

International travel : Expandable function + TSA lock + silent casters.

If you use public transportation frequently : Casters with stoppers + hooks for hanging things.

Lots of gadgets : USB port + organizing pocket.

It's easier to choose if you imagine the scenarios in which you'll actually use it and narrow it down to two or three features that make things easier. If you add everything, it may become too heavy, so balance is important!