The 2 pieces set includes 24 inches and 28 inches. One set just satisfies all your different travelling needs.Lightweight 100% ABS material. smooth 360° spinner wheels and carrying top and side handles make your trips more easily.Upgraded with 3-digit combination TSA lock. so that only you or a TSA agent have easy access to your belongings when traveling.Maximize 25% more space of your packing power with the Expandable feature. Large storage space and fully lined interior with zippered compartment to keep your items organized.The complete 2 piece suitcase set will be shipped with each suitcase inside one another to save space for your convenience.Instructions for Reset the combination lock1.The lock is Pre set to 0-0-0; 2. Push the button on the broadside. while in this position. set each number to your preference; 3. Release the button and your combination is now set;4.Take care when setting the numbers to not release the button while setting it.