A method for packaging an image forming apparatus in which a first developer cartridge is mounted, the first developer cartridge having a first opening for passing developer therethrough, the method comprising:
- a mounting step, mounting the first developer cartridge into the image forming apparatus in a first posture, the image forming apparatus being in the first posture when an image is formed;
- and
- a packaging step, packaging the image forming apparatus with the first developer cartridge mounted therein in a packaging member such that the image forming apparatus is in a second posture, leakage of the developer through the first opening of the mounted first developer cartridge is less likely to occur when the image forming apparatus is in the second posture compared to when the image forming apparatus is in the first posture, and the second posture being rotated 90 degrees with respect to the first posture.