Abstract: A bag construction has a sheet of material in the form of a flattened tube having front and back panels defining sides and where the tube has an open end. There is a line of weakness proceeding from the open end of the bag through the front and back panels. The line of weakness is located substantially centrally with respect to the sides of the bag and sized so that when the line of weakness is torn, two opposing lengths of material are formed. The lengths sized to allow the tying of a knot thereby, so as to substantially seal the open end of the bag.