A. Saks 21" Expandable Carry On (Black) Carry on only weighs 1.3 pounds Made of strong 420 denier nylon Each side expands independently to a total of 4" The 2 handles are on fastex and by connecting them together, the handles become a shoulder strap. Bag zips into a flat pouch for easy storage - The AE-21 has 2 expandable zippers, one on each side. By expanding both sides, the 2 expandable zippers actually zip around so that the bag zips up into itself.