A large wheeled box was built to hold Jumbo during his journey to America. It was made of heavy pine boards bolted to a strong oak base, and made even stronger with iron straps. It measured long, wide, and high. It was large enough for Jumbo to stand in it, but it was not large enough for him to lie down or turn around. Although the ends of the box were open, they were made strong with iron bars. Jumbo could look out the open end and swing his trunk.