A Front Opening Unified Pod (FOUP) having a purgeable supporting module disposed at the junction of each sidewall and the backwall of the container, the characteristic of the FOUP being in that: the purgeable supporting module has a buffer gas chamber and a gas inlet is disposed at one end of the buffer gas chamber and connected to a gas valve on the bottom surface, an outgassing channel is disposed on the purgeable supporting module facing the opening of the FOUP, and a long slot is disposed on one side of the outgassing channel, an airflow channel being disposed between and thus connecting the outgassing channel and the buffer gas chamber, and a plurality of supporting ribs being vertically disposed on one side of the long slot at intervals.