A reusable pour spout system that may be attached to different container types to dispense different substances, including course and fine granular materials and liquids. A port component has a proximal tubular end and a flange that is larger than the tubular end. The flange further includes a hole-cutting structure adapted to pierce the wall of a container, with a cutting edge adapted to form a hole in the container when the port component is rotated by a user after piercing. This positions the flange within the container with the tubular end exposed to receive a nut that traps the wall of the container between the nut and the flange. A cap is provided to seal off the port. The tubular end of the port component, the nut, and the cap may all be threaded. Different structures to enhance cutting and sealing are disclosed along with preferred method steps.