Insert Bag: The ZUCA Sport Insert is a removable, hand-washable insert bag that is made from premium, water-resistant 600D polyester. Compatibility: It is compatible with the ZUCA aluminum alloy Sport Frame. This bag does not meet FAA specifications for carry-on baggage. Protective Floor Panel: It has a floor panel to protect the bottom and a net pocket inside at the top of the bag. Opens Like a Door: The front door opens like a door instead of flopping on the ground when open. Improved Water-Resistance: The 600D polyester material offers enhanced water-resistance