Our Wardrobe Boxes (24" x 21" x 36") are made of extra strength 48ECT Double Wall corrugated packed in bundles of 4, 6, 9 and 12 wardrobe boxes. Each wardrobe box comes with a sturdy metal hanger bar so you can simply transfer items from you closet to the wardrobe box. You will appreciate it if you have a small elevator or no elevator at all. Good for people who do not have many clothes. It can also be used for miscelaneous and fragile tall items.