A machine for erecting a polygonal container from a knocked-down flat (KDF) container formed from a blank of sheet material is provided. The container includes four main side panels, at least one corner panel extending between two of the main side panels, and at least one bottom flap extending from one of the main side panels. The machine includes a body, a first erecting mechanism coupled to the body, and a second erecting mechanism coupled to the body. The first erecting mechanism receives the KDF container and erects the KDF container into a partially erected container having a substantially rectangular configuration, and the second erecting mechanism receives the partially erected container and erects the partially erected container from the substantially rectangular configuration into the polygonal container by applying a force to an exterior surface of the partially erected container to erect the polygonal container that has more than four sides.