The Swiss Wenger Fortress Expandable Suitcase has the reliability that savvy travellers expect in a luggage bag, with even more security features like an integrated TSA lock and lockable zippers on the main compartment.which can be expanded another 2" for even more packing capacity. Its hardcase exterior is constructed of durable and lightweight ABS, taking you to all your desired destinations. The smooth dual wheel system provides unmatched maneuverability. Perfect for city travelling, it’s easy to maneuver through crowded streets or on the train.