Abstract: A bag discharge constriction apparatus and method are disclosed in which the extent to which an opening in a bag is constricted is adjustably varied to control the discharge of material from the bag. The apparatus has a first control bar and a second control bar, each defining at least one angular relationship in a corresponding plane. Also disclosed is a means for moving at least one control bar in its associated plane toward and away from the other control bar. The control bars are disposed in opposing configuration such that the combination of the angular relationships forms a predetermined confined shape between the control bars. It is into this predetermined confined shape that the neck of the bag to be constricted is placed and the bars are then moved toward or away from each other to constrict or open the neck of the bag.