It is the unique combination of a 20-inch expandable carry-on upright and a 17-inch backpack that makes this an amazingly versatile 2-piece carry-on luggage set. The 20-inch expandable rolling upright is ideal for any short trips or as a carry-on suitcase. The 17-inch backpack can be used as the allowed personal item along with the carry-on suitcase when you travel. It is great for books, personal hand-held devices, jackets, or any last minute items that you want to bring with you. With its lightweight construction, this set is also great for kids.