The invention relates to an air cargo container with an interior space limited by a wall and sealed against the exterior for avoiding an entry of fluid. The wall comprises a first operating configuration wherein said interior space limited by the wall has a first volume VI1. Furthermore, in case of a fire the wall is deformed into a second operating configuration wherein said interior space limited by the wall comprises a second volume VI2 being smaller than the first volume VI1. A check valve blocks fluid from streaming from the exterior into the interior space but opens for a stream from the interior space to the exterior. An actuation means for changing the operating configuration in case of a fire automatically transfers the wall from the first operating configuration into the second operating configuration. During this transfer fluid is pushed from said interior space via the check valve to the exterior.