A system is claimed for forming a container from a tubular blank comprising a plurality of panels and flaps interconnected to provide a generally flattened tubular configuration. A first and second panels are provided with the second panel being rotatable relative to the first panel. The system may comprise a first engagement device for engaging the first panel and a second engagement device for engaging the second panel, and being located on a panel rotating apparatus operable to rotate the second panel from an orientation generally parallel to the first panel to a second orientation at an angle to the first panel. The generally flattened tubular blank may be reconfigured from a generally flattened configuration to an open configuration.