Luggage sets 3 piece(20/24/28), expandable carry on luggage with TSA lock airline approved, 100% PC hard shell and lightweight suitcase with front pocket and spinner wheels. Lightweight luggage sets: made of environmentally friendly imported ultra-light PP material, compared with abs and PC plastics, PP materials suitcase have better resilience, it can be restored to its original state after being hit violently. Luggage 4 piece sets are the best choice for travel, family travel and business travel. Expandable 4-piece luggage set: the 14-inch suitcase can store some daily necessities such as cosmetics, water glasses, etc. Which is easy to access at any time. 20 inch carry on luggage & 24 inch suitcase is perfect for business and personal travel, 24 inch & 28 inch luggage is expandable, which can expand 25% of the additional space.