An image forming apparatus includes a plurality of containers, a container compartment, and a plurality of indicators. The plurality of containers contains developing agent, and may be arranged in parallel with each other in a first sequential order. The container compartment holds the plurality of containers at varied holding heights. The plurality of indicators indicates information of the developing agent in the plurality of containers, and may be arranged in parallel to each other in a second sequential order on the image forming apparatus. The first sequential order of the plurality of containers corresponds to the second sequential order of the plurality of indicators.