Mixi Carry On Luggage with Cup Phone Holder Hard Shell Rolling Travel Suitcases with Spinner Wheels,20 Inch Blackish Green

This carry-on luggage includes a built-in TSA security combination lock, allowing airport security personnel to open and inspect the suitcase without damaging the lock. This is particularly useful for travel to and from the United States, providing added security and convenience.

This carry-on luggage does not feature a double wheel function. It uses four single spinner wheels, which provide smooth and easy maneuverability in any direction. While double wheels can offer enhanced stability, the single spinner wheels are adequate for most travel surfaces.

This carry-on luggage does not have an expandable function. The capacity is fixed at 42L, which may limit packing flexibility for longer trips or when purchasing souvenirs. Travelers needing more space may need to consider a larger suitcase or pack more efficiently.

This carry-on luggage does not include a brake function. A brake function would prevent the suitcase from rolling away on slopes or in crowded places, providing added safety and convenience. However, this feature is not commonly found in carry-on luggage.

This carry-on luggage does not have a USB port function. A USB port would allow for convenient charging of smartphones or other devices while waiting at the airport or during travel. However, this feature is not included, so travelers will need to rely on power banks or wall chargers.

This carry-on luggage does not feature a front open function. A front open function would allow easy access to items stored in the front compartment without fully opening the suitcase. This can be useful for quickly retrieving documents or small items, but it is not available on this model.