A lockable pivoting articulation joint includes a first joint section, a second joint section, a pivot bearing allowing the first and second joint sections to be rotatable in relation to each other about a main axis, and a locking mechanism on the first joint section switchable between a release condition and a locking condition. The second joint section is lockable in relation to the first joint section in at least one relative rotational position. On the second joint section a retaining surface is provided. The locking mechanism has a clamping lever attached to the first joint section to be pivotable about a clamping lever axis between a locking position and a release position. The clamping lever has a clamping surface for locking abutment on the retaining surface and the clamping surface is inclined in relation to a tangential plane.

A compactly packageable sofa includes a seat back, a seat cushion, two arm panels and a zippered flap. In the assembled state of the sofa, the seat cushion and the seat back are held between the arm panels, and the zippered flap is attached to both the seat back and the seat cushion. The seat back does not contact the seat cushion in the assembled state of the sofa. In the compact state of the sofa, the seat back, the seat cushion and the arm panels are not attached to one another. Instead, the arm panels fit inside a compartment under the seat cushion. The flap is not attached to both the seat back and the seat cushion in the compact state of the sofa. In the compact state, the sofa is contained in a packing box whose width is only slightly greater than the depth of the seat cushion.