Device for collecting and compacting waste comprising a) a container for accommodating a waste bag, the container comprising side walls, a moving base plate inside and a first seal at the opening, b) a cover with a second seal, wherein the cover is configured and arranged such that: • it can be brought to an open position with respect to the opening of the container, so that the opening of the container is accessible for placing a waste bag inside, and • it can be brought to a closed position with respect to the opening of the container, so that the cover interacts positively with the opening of the container such that a waste bag placed inside the container between the first seal and the second seal can be sealed airtight against the cover, c) means for producing compressed air, d) means for producing negative pressure, and e) means for heat sealing a waste bag placed inside the container when the cover is in the closed position, wherein the means are situated at the opening of the container and/or on the cover, wherein the cover has an aspiration opening, which is arranged on the cover such that in the closed position, the gaseous atmosphere can be partially aspirated from the interior of a waste bag placed inside the container by means of the means for producing negative pressure, when the opening is closed, the container is sealed airtight, the base plate of the container can be moved with respect to the side walls and, in the closed position, in the direction of the cover, the device has means for moving the base plate with respect to the side walls, characterised in that the container has an inlet port for compressed air, which, controlled by means of an inlet valve, can be charged with compressed air supplied by the means for producing compressed air. a) a container for accommodating a waste bag, the container comprising side walls, a moving base plate inside and a first seal at the opening, b) a cover with a second seal, wherein the cover is configured and arranged such that: • it can be brought to an open position with respect to the opening of the container, so that the opening of the container is accessible for placing a waste bag inside, and • it can be brought to a closed position with respect to the opening of the container, so that the cover interacts positively with the opening of the container such that a waste bag placed inside the container between the first seal and the second seal can be sealed airtight against the cover, • it can be brought to an open position with respect to the opening of the container, so that the opening of the container is accessible for placing a waste bag inside, and • it can be brought to a closed position with respect to the opening of the container, so that the cover interacts positively with the opening of the container such that a waste bag placed inside the container between the first seal and the second seal can be sealed airtight against the cover, c) means for producing compressed air, d) means for producing negative pressure, and e) means for heat sealing a waste bag placed inside the container when the cover is in the closed position, wherein the means are situated at the opening of the container and/or on the cover, wherein the cover has an aspiration opening, which is arranged on the cover such that in the closed position, the gaseous atmosphere can be partially aspirated from the interior of a waste bag placed inside the container by means of the means for producing negative pressure, when the opening is closed, the container is sealed airtight, the base plate of the container can be moved with respect to the side walls and, in the closed position, in the direction of the cover, the device has means for moving the base plate with respect to the side walls, characterised in that the container has an inlet port for compressed air, which, controlled by means of an inlet valve, can be charged with compressed air supplied by the means for producing compressed air.