Abstract: The present continuously operable bag opening apparatus has two conveyor belts. The upstream end of each belt is supported on a horizontal drive member. The downstream end of each belt is supported on a respective substantially vertically extending guide roller, whereby the upper runs of the conveyor belts form a downwardly open channel, the belt walls of which converge toward the downstream end of the two conveyors. A rotary knife is arranged between the belts so that a bag which travels on the belts over the knife is cut open and its content falls down though said channel.