Abstract: A port and method for retaining a sheet of material within a wall. The port comprises an opening extending through the wall and a single slot extending radially therefrom. The method comprises twisting a free edge of the material into a cylindrical shape, inserting the cylindrical shape of the material through the opening and pulling the cylinder into the slot so as to secure the cylindrical shape therein. A container may also have a sidewall and at least one a port for retaining a sheet of material within a wall of the container extending therethrough. Each port comprises an opening extending through the wall and a single slot extending radially therefrom. The slot may include a stress relieving bore having an inverted tear-drop shape at a distal end thereof.