4-piece luggage set includes 20 inch carry-on luggage, 24 inch checked luggage and 28 inch large luggage, and comes with a travel bag. By the way, the travel bag can be inserted into the luggage, very convenient. The interior of the suitcase is spacious, with X-shaped elastic straps and built-in wet and dry storage bags. Uniform color, classic black, fashion design. Easy to slide in any direction, very smooth, compared to other single wheel luggage will be more durable and not easy to damage. The best choice for short-term or long-term business trips. Made of lightweight, waterproof PC&ABS mixed hard shell material, three layers of thickened luggage, compared to other ABS suitcase alone is more durable and scratch resistant. Luggage edge design anti-collision angle protection, more impact resistant. At the airport for checked security screening, the security agency can normally open, inspect and re-lock without causing damage to the suitcase. Please check our manual for details on how to set a password. The USB charging port is designed at the top of the suitcase for more convenience. The cup holder is located at the back of the suitcase, so that we can easily place the water cup and fold it up when not in use. In addition, the side of the suitcase is set up with hooks, which can be easy to hang our shopping bags or backpacks, etc., and free our hands. By the way, all three of our suitcases contain these features. Upgraded 3 piece luggage sets, includes 20 inch carry-on luggage, 24 inch checked luggage and 28 inch large luggage and 1piece travel bag for a total of 4 pieces. Meet all your needs, whether it's for business, vacation, school or camping outdoors. The classic black color paired with a design textured look makes our luggage stand out.