the present disclosure relates to a stay - open configuration or structure at the mouth of a polymeric or similar package or bag , wherein the configuration or structure has sufficient stiffness or tenacity to be able to maintain the mouth of the package or bag in an open position after being placed into this position . the semi - rigid material which implements the stay - open configuration can be incorporated into zipper components , such as , but not limited to , the flanges . the semi - rigid material may further be a separate element which is attached proximate to the zipper . the semi - rigid material typically goes through processes of extrusion and orientation .