A containing apparatus of groups of packages (G1, G2; G3, G4) in transit, with the packages arranged in at least a row, comprising: - a support (11, 12, 121, 122), to support a group of packages (G1, G2; G3, G4) with the packages arranged in at least a row, which comprises a first support part having a first slot and a second support part having a second slot; - a first part for contacting packages; - first movement means which move the first part between an extracted position, in which the first part exits superiorly from the support (11, 12, 121, 122) through the first slot, and a retracted position and vice versa; - a second part for contacting packages; - second movement means which move the second part between an extracted position, in which the second part exits superiorly from the support (11, 12, 121, 122) through the second slot, and a retracted position and vice versa; wherein: - the first slot and the second slot are arranged in such a way that the first part and the second part contain, in a predetermined volume at least a row of the group of packages (G1, G2; G3, G4) in the relative extracted positions; - the first movement means and the second movement means are configured to move the first part and the second part on the basis of the transit of the group of packages (G1, G2; G3, G4); the containing apparatus being characterised in that: - the first support part is raised with respect to the second support part, or vice versa, and the first support part is movable with respect to the second support part according to an adjustment direction, between a first position and a second position, so as to vary the distance between the first slot and the second slot on the basis of the predetermined volume; - the second support part protrudes from the second slot towards the first slot so that the first support part covers the second support part, or vice versa, in both the first position and the second position; - it comprises a movement device which moves the first part and the first support part so that they perform the same displacements along the adjustment direction. - a support (11, 12, 121, 122), to support a group of packages (G1, G2; G3, G4) with the packages arranged in at least a row, which comprises a first support part having a first slot and a second support part having a second slot; - a first part for contacting packages; - first movement means which move the first part between an extracted position, in which the first part exits superiorly from the support (11, 12, 121, 122) through the first slot, and a retracted position and vice versa; - a second part for contacting packages; - second movement means which move the second part between an extracted position, in which the second part exits superiorly from the support (11, 12, 121, 122) through the second slot, and a retracted position and vice versa; - the first slot and the second slot are arranged in such a way that the first part and the second part contain, in a predetermined volume at least a row of the group of packages (G1, G2; G3, G4) in the relative extracted positions; - the first movement means and the second movement means are configured to move the first part and the second part on the basis of the transit of the group of packages (G1, G2; G3, G4); - the first support part is raised with respect to the second support part, or vice versa, and the first support part is movable with respect to the second support part according to an adjustment direction, between a first position and a second position, so as to vary the distance between the first slot and the second slot on the basis of the predetermined volume; - the second support part protrudes from the second slot towards the first slot so that the first support part covers the second support part, or vice versa, in both the first position and the second position; - it comprises a movement device which moves the first part and the first support part so that they perform the same displacements along the adjustment direction.