Four-piece set is easy to spot on the luggage carousel, and all pieces nest together for easy storage! All but the duffel bag are wheeled, and all pieces are surprisingly sturdy. Wheeled suitcases have zippers to expand larger. Zippered pockets on the outside of all the suitcases. Smallest wheeled suitcase meets carry-on requirements for major airlines. Sell as a complete set, or split off into individual pieces and get creative with the retail prices!