A, in the closed state, gas-tight transport container of circular cross section and having an interior which can be made accessible by the fact that the two container parts (1, 2) obtained in the separation and demarcated one from the other are arranged so as to be openable one from the other by separation transversely to their own specific longitudinal direction, in which the two container parts (1, 2), upon closure of the container, are locked one against the other by means of an intervening locking ring which is rotatable relative to the container parts (1, 2) transversely to their mutually facing end edges and which is locked in both container parts in one and the same locking operation by means of integral coupling elements, characterized in that the transport container is detonation-proof for the storage and transport of detonation-dangerous or suspected detonation-dangerous material, in that, upon opening of the transport container, the two container parts (1, 2) are arranged so as to be axially displaceable one relative to each other, in that the locking ring has a multi-toothed double-sided bayonet coupling comprising two oppositely directed locking grooves (11 and 12) with mutually facing coupling elements (15, 16) of the container parts (1, 2) disposed on either side thereof, whilst these container parts (1, 2), in turn, have coupling elements (7, 8) matched to their respective bayonet coupling and each comprising a respective toothed rim, and in that the locking ring, upon closure of the transport container, can be rotated by a distance corresponding to at least one tooth width on the toothed rim (7, 8) to which the locking groove (11 or 12) is matched, and the coupling elements (7, 8) of the respective container part (1, 2) which are facing towards the locking ring are constituted by a considerable number of locking teeth (7, 8), which are disposed along their own specific outer end edge facing, in the coupled-together state, towards the locking ring and extend radially outwards and inwards along the radially outer and inner peripheries respectively of the said end edge, whereby these locking teeth together form a double-sided toothed rim (7, 8) which closes off the transport container wall in the said direction and has a plurality of outward and inward facing locking teeth and, between these, radially directed tooth gaps (9, 10), each matched to the periphery accessible to the respective toothed rim, and the said container parts (1, 2) which face one another with their open ends as the container (1, 2) is closed being held together in the coupled-together closed state by the locking ring which is disposed rotatably relative to the said container parts (1, 2) between the end edges thereof and which, in turn, has the locking groove (11, 12) matched to each such end edge, each of which locking grooves having been matched to the end-closing double toothed rim (7, 8) of the respective container part (1, 2) and having therefore been configured with the same number of locking teeth (16, 15) disposed along their own specific inner and outer periphery, and the same number of tooth gaps as this, and a free space between their own specific locking teeth and the bottom of the respective locking groove, which bottom at least corresponds to the tooth thickness of the locking teeth (7, 8) in the one of the toothed rims of the container parts (1, 2) to which the locking groove in question (11, 12) is matched.