DESC: The Cruzer3 is our new and improved lightweight 4 piece luggage set that is also EXPANDABLE. It is made from our super-flexible Polycarbonate composite material. The new features include Piggy-Back straps, now you can carry all 4 pieces with just one hand, as each piece comes with its own detachable piggy-back strap. The Cruzer3 is now 'side-opening' as it's more convenient to open and close the luggage this way. Another new feature is its 'Flat-Interior' we have encased the trolley tubes into a special protrusion along the backside so that you will have a completely FLAT surface to pack within.