Sealed reusable bulk material container

In an intermediate bulk container for holding bulk material, having a closable inlet for the bulk material in an upper closure of the container, a cross-sectional geometry narrowing in the outlet direction for the bulk material to comprise a narrowed outlet portion, an outlet tube for the bulk material arranged subsequently in the outlet direction, the improvement being in that the outlet tube being concentrically vertically aligned and axially communicating with the narrowed outlet portion, the outlet tube having a mouth, a first reversible mechanical closure device (A), which is arranged in the transition region from the narrowed outlet portion of the container body to the outlet tube or in the outlet tube itself and, by opening, releases the bulk material from the interior of the container into the outlet tube through the mouth of the outlet tube and by closing prevents release of the bulk material, and a second closure device (B) which reversibly closes the mouth of the outlet tube, the second closure device being a cover which is pressed flush onto the mouth of the outlet tube by means of a closing device, there being a seal on the cover which seals the outlet tube in a gas- and liquid-tight fashion from the external environment at least on the contact surface of the cover with the mouth of the outlet tube, wherein the cover is attached by the closing device which is a clamping ring or a bayonet closure onto the mouth of the outlet tube, wherein the cover has a convexly curved cover edge strip with the concavity of the cover edge strip receiving the seal, and a mouth edge of the outlet tube has a mouth edge strip, and the seal bears on the mouth edge strip in the connection of the cover to the mouth edge of the outlet tube, and the mouth edge strip and the seal and the cover and the cover edge strip and the closing device all being vertically aligned with the narrowed outlet portion.