Bag closure construction

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.

I claim: 
     
         1 . A bag construction comprising a sheet of material in the form of a flattened tube; the tube having front and back panels defining sides; the tube having an open end; the bag construction further comprising:
 a line of weakness; the line of weakness proceeding from the open end of the bag through the front and back panels;   the line of weakness located substantially centrally with respect to the sides of the bag;   the line of weakness 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.   
     
     
         2 . The bag construction of  claim 1 , further comprising a knot tied with the two opposing lengths of material. 
     
     
         3 . The bag construction of  claim 1 , where the sheet of material is a plastic. 
     
     
         4 . The bag construction of  claim 1 , where the bag has a flange located at the open end of the bag. 
     
     
         5 . A bag construction comprising a sheet of material in the form of a flattened tube; the tube having front and back panels defining sides; the tube having an open end; the bag construction further comprising:
 a line of weakness; the line of weakness proceeding from the open end of the bag through the front and back panels;   the line of weakness located substantially centrally with respect to the sides of the bag;   the line of weakness 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; and,   the bag further comprising where the bag a flange located at the open end of the bag.   
     
     
         6 . The bag construction of  claim 1 , further comprising a knot tied with the two opposing lengths of material. 
     
     
         7 . The bag construction of  claim 1 , where the sheet of material is a plastic.