Shipping tube

A heavy duty composite fibre tube. The layers of spiral-wound paper used in its construction are visible. This type of heavy tube is also used as a core for wrapping roll goods.
Long corrugated box, square cross section
Paperboard tubes

A shipping tube, mailing tube, or cardboard tube is a shipping container used to ship long items. It is usually a long package with a narrow cross-section: square, triangle, or round.