A packaging assembly (1; 1') configured to form and seal a plurality of packs containing a pourable product starting from a tube of packaging material; said packaging assembly (1; 1') comprising: - a pair of endless tracks between which said tube is fed along a straight advancement direction; and - a pair of movable members (7; 7'), each one of which movably coupled to, and cyclically movable along, one respective track; each movable member (7; 7') of said pair of movable members (7; 7') movably carrying one respective forming member (18; 18') linearly movable towards said tube, transversally to said advancement direction, adapted to cyclically cooperate in contact with successive tube portions, so as to form at least corresponding pack portions of respective packs; wherein each forming member (18; 18') comprises a movable portion (21; 21') and each movable member (7; 7') comprises a movable element linearly movable towards said tube and supporting the movable portion (21; 21') of the respective forming member (18; 18'), wherein the packaging assembly further comprises actuator means configured to drive a tilting movement of each movable portion (21; 21'), said movable portion (21; 21') being therefore tiltable with respect to the movable element and with respect to said advancement direction of a given angle (α), said actuator means comprising, for each track, at least one cam surface (26; 34) fixed with respect to the track, and a cam follower (25; 33) carried by the respective forming member (18; 18') and configured to cooperate in a sliding manner with said cam surface (26; 34), characterized in that the actuator means are therefore configured to drive a tilting movement of each tube portion, and each movable portion (21; 21') is tiltable to sequentially control a tilting of said tube portions with respect to said advancement direction. said packaging assembly (1; 1') comprising: - a pair of endless tracks between which said tube is fed along a straight advancement direction; and - a pair of movable members (7; 7'), each one of which movably coupled to, and cyclically movable along, one respective track; - a pair of endless tracks between which said tube is fed along a straight advancement direction; and - a pair of movable members (7; 7'), each one of which movably coupled to, and cyclically movable along, one respective track; each movable member (7; 7') of said pair of movable members (7; 7') movably carrying one respective forming member (18; 18') linearly movable towards said tube, transversally to said advancement direction, adapted to cyclically cooperate in contact with successive tube portions, so as to form at least corresponding pack portions of respective packs; wherein each forming member (18; 18') comprises a movable portion (21; 21') and each movable member (7; 7') comprises a movable element linearly movable towards said tube and supporting the movable portion (21; 21') of the respective forming member (18; 18'), wherein the packaging assembly further comprises actuator means configured to drive a tilting movement of each movable portion (21; 21'), said movable portion (21; 21') being therefore tiltable with respect to the movable element and with respect to said advancement direction of a given angle (α), said actuator means comprising, for each track, at least one cam surface (26; 34) fixed with respect to the track, and a cam follower (25; 33) carried by the respective forming member (18; 18') and configured to cooperate in a sliding manner with said cam surface (26; 34), characterized in that the actuator means are therefore configured to drive a tilting movement of each tube portion, and each movable portion (21; 21') is tiltable to sequentially control a tilting of said tube portions with respect to said advancement direction.