Corrugated tube that can be folded open, for holding cables (3 - 5), comprising: a first corrugated tube shell, which has a plurality of first corrugated tube ribs extending peripherally around said first corrugated tube shell, a second corrugated tube shell, which has a plurality of second corrugated tube ribs extending peripherally around said second corrugated tube shell, a joint section, which separates the corrugated tube ribs (19, 20) of the two corrugated tube shells (6, 7) from each other and by means of which the two corrugated tube shells (6, 7) are pivotably connected to each other at respective first end sections (8, 9) thereof, and a locking device for locking the two corrugated tube shells (6, 7) to each other when the corrugated tube is brought from a folded-open state, in which the first corrugated tube shell is arranged outside of the second corrugated tube shell, into a folded-together state of the corrugated tube, in which the first corrugated tube shell is arranged inside the second corrugated tube shell at least in sections, wherein the locking device includes the corrugated tube ribs (19, 20), wherein in the folded-together state of the corrugated tube, the second corrugated tube ribs extend around the first corrugated tube ribs interlockingly both in a radial direction and in a peripheral direction of the corrugated tube wherein the first corrugated tube shell and the second corrugated tube shell are pivotable relatively to each other about an axis of rotation when the corrugated tube is brought from the folded-open state into the folded-together state or vice versa, and wherein the first corrugated tube shell and the second corrugated tube shell are pivotable relatively to each other by a pivot angle (γ), characterized in that the corrugated tube further comprises at least one lip section (16, 17), which is provided on a second end section of the first corrugated tube shell and/or on a second end section of the second corrugated tube shell, wherein the at least one lip section (16, 16) is made of a different material than the corrugated tube shells (6, 7), and in that the locking device comprises first pocket sections, which are formed on the first corrugated tube ribs, and second pocket sections, which are formed on the second corrugated tube ribs, wherein the first pocket sections are held in the second pocket sections in the folded-together state of the corrugated tube, wherein each first pocket section comprises a front wall and each second pocket section also comprises a front wall, and wherein in the folded-together state of the corrugated tube, the respective front wall of the first pocket sections abuts against the respective front wall of the second pocket sections so that the pocket sections (36, 38) interlockingly extend around each other in the peripheral direction. a first corrugated tube shell, which has a plurality of first corrugated tube ribs extending peripherally around said first corrugated tube shell, a second corrugated tube shell, which has a plurality of second corrugated tube ribs extending peripherally around said second corrugated tube shell, a joint section, which separates the corrugated tube ribs (19, 20) of the two corrugated tube shells (6, 7) from each other and by means of which the two corrugated tube shells (6, 7) are pivotably connected to each other at respective first end sections (8, 9) thereof, and a locking device for locking the two corrugated tube shells (6, 7) to each other when the corrugated tube is brought from a folded-open state, in which the first corrugated tube shell is arranged outside of the second corrugated tube shell, into a folded-together state of the corrugated tube, in which the first corrugated tube shell is arranged inside the second corrugated tube shell at least in sections, wherein the locking device includes the corrugated tube ribs (19, 20), wherein in the folded-together state of the corrugated tube, the second corrugated tube ribs extend around the first corrugated tube ribs interlockingly both in a radial direction and in a peripheral direction of the corrugated tube wherein the first corrugated tube shell and the second corrugated tube shell are pivotable relatively to each other about an axis of rotation when the corrugated tube is brought from the folded-open state into the folded-together state or vice versa, and wherein the first corrugated tube shell and the second corrugated tube shell are pivotable relatively to each other by a pivot angle (γ), characterized in that the corrugated tube further comprises at least one lip section (16, 17), which is provided on a second end section of the first corrugated tube shell and/or on a second end section of the second corrugated tube shell, wherein the at least one lip section (16, 16) is made of a different material than the corrugated tube shells (6, 7), and in that the locking device comprises first pocket sections, which are formed on the first corrugated tube ribs, and second pocket sections, which are formed on the second corrugated tube ribs, wherein the first pocket sections are held in the second pocket sections in the folded-together state of the corrugated tube, wherein each first pocket section comprises a front wall and each second pocket section also comprises a front wall, and wherein in the folded-together state of the corrugated tube, the respective front wall of the first pocket sections abuts against the respective front wall of the second pocket sections so that the pocket sections (36, 38) interlockingly extend around each other in the peripheral direction.