Development of the fabric aspects of this semi rigid suitcase. Lightweight yet sturdy, this Rollink Flex 21" carry-on luggage suits all your travel needs. Its tough shell is made from polypropylene for long-lasting usage and offers maximum impact-resistance. A spacious 40L storage capacity allows for clutter-free storage of all your travel items. When not in use this suitcase folds down in a compact size, saving you room in your storage space.