How do you build a cardboard barrel?

To build a cardboard barrel, start by cutting a large piece of cardboard into a rectangle, then roll it into a cylinder and secure the edges with strong tape or glue. Next, create two circular pieces for the top and bottom by tracing a round object, cutting them out, and attaching them to the ends of the cylinder. Reinforce the structure with additional layers of cardboard, if needed, and finish by decorating or painting the barrel as desired. Ensure the barrel is sturdy enough for your intended use.