This four-piece family spans 16" to 28", every case rolling on silent 360° double wheels that eat airport carpet and city streets alike while the three-step handle rights itself for kids, parents or grandparents. Size-10 zipper teeth bite tighter for tear-free trips, a TSA 3-dial lock guards your gear, and built-in UV protection keeps the shells looking new for years of vacations. Four included packing cubes sort clothes and toiletries, the two largest cases expand 20 % for souvenir overflow, and the whole set nests together in a closet-saving stack when the adventure ends.