Pressure-tight storage vessel (V) containing a liquid (F2), having an elongate main body (G) which is rotationally symmetrical with respect to an axis of symmetry (SA) and which forms, at least sectionally, a rotationally symmetrical hollow space (H), in particular a circular-cylindrical or conical-cylindrical hollow space (H), in which the liquid (FL) is substantially received, wherein the main body (G) is terminated at its bottom side (U) by a base (B) and furthermore, at its top side (O), has an opening (OF) which is closed off in a pressure-tight manner by a closure (VS), furthermore having a plurality of reinforcement elements (VE) which bear against the main body (G) at the outside and which extend parallel to the axis of symmetry (SA) of the main body (G) and which are arranged rotationally symmetrically about the axis of symmetry (SA) of the main body (G) such that, in each case between adjacent reinforcement elements (VE), respective externally exposed wall sections (W) of the main body (G) are formed, and wherein the composition of the exposed wall sections (W) permits a pressure-tight insertion by at least two hollow needles (N1, N2), characterized in that the main body (G) has no separating seam and no sprue residues on the exposed wall sections (W) for the insertion of the needles (N1, N2), in that the closure of the storage vessel is a film which is attached to the border by means of a melting process, in that the main body (G) has a recess at the bottom side (U) of the main body (G). and in that the main body (G) and the reinforcement elements (VE) are produced in one piece from plastic by means of an injection moulding process, preferably from polyethylene, particularly preferably high-density polyethylene. having an elongate main body (G) which is rotationally symmetrical with respect to an axis of symmetry (SA) and which forms, at least sectionally, a rotationally symmetrical hollow space (H), in particular a circular-cylindrical or conical-cylindrical hollow space (H), in which the liquid (FL) is substantially received, wherein the main body (G) is terminated at its bottom side (U) by a base (B) and furthermore, at its top side (O), has an opening (OF) which is closed off in a pressure-tight manner by a closure (VS), furthermore having a plurality of reinforcement elements (VE) which bear against the main body (G) at the outside and which extend parallel to the axis of symmetry (SA) of the main body (G) and which are arranged rotationally symmetrically about the axis of symmetry (SA) of the main body (G) such that, in each case between adjacent reinforcement elements (VE), respective externally exposed wall sections (W) of the main body (G) are formed, and wherein the composition of the exposed wall sections (W) permits a pressure-tight insertion by at least two hollow needles (N1, N2), characterized in that the main body (G) has no separating seam and no sprue residues on the exposed wall sections (W) for the insertion of the needles (N1, N2), in that the closure of the storage vessel is a film which is attached to the border by means of a melting process, in that the main body (G) has a recess at the bottom side (U) of the main body (G). and in that the main body (G) and the reinforcement elements (VE) are produced in one piece from plastic by means of an injection moulding process, preferably from polyethylene, particularly preferably high-density polyethylene. <EOS>