Abstract: The gas which is to be introduced into a compressed gas container (50) is stored in a storage container (10) at a high pressure of approximately 250 bar. A booster compressor (20) is connected downstream of the storage container: The outlet of the booster compressor can be connected to a pre-filling container (30) via a valve apparatus (22). The compressed gas container (50) is filled first of all by the pre-filling container (30). When the pressure of the latter is no longer sufficient, a switchover is carried out, wherein the further filling takes place by the booster compressor (20) via a cyclone tube (40) or an injection device. In this way, a large storage container can be filled in a short time.