PT. Eksonindo MPI is a company that manufactures various kinds of bags that are marketed with Export, Eiger and Bodypack trademarks. At present, operators who carry out their work often complain that certain parts of their body hurt. This pain is caused by the presence of a poor working system. Improving the work system can be accomplished by analyzing the body posture of nine specific work activities. Analysis of the worker’s posture employs the REBA method. The results of the REBA analysis indicate that all nine activities carry moderate and high risks. Proposed improvements have been made by designing table and chair sizes using the anthropometric data of the Indonesian workers involved. The proposed improvements made at a later stage were simulated and recalculated using the REBA score. The simulation results of proposed improvements show a significant improvement so that it will be convenient as a safety fund or investment for workers.