A packaging system for immobilizing one or more objects has a box having a bottom and at least four side walls and a wedge in the form of a sheet. The sheet has a central portion of a polygonal shape that is generally square or rectangular. The central portion has dimensions corresponding to the bottom of the box. The sheet has one or more flaps on each of at least two edges of the central portion. The flaps are attached by an articulation to the central portion so as to allow movement of the flaps to conform against the side walls of the box so as to fasten the wedge on the side walls of the box after the wedge has been pushed down into the box.