Top and middle level have opening to go down bottom level no opening. 3 doors 1 on each level. Completely collapsable all pieces fit in my honda accord trunk. Great for traveling zoo type thing or idk anything u want really. It is missing some clips and screws but does not affect the stability of the cages. Its about 60 in tall and 24-30 inces wide. Total weight maybe 30-50lbs see attached photo these retail for 600 but its on sale for almost 500 bucks