A packaging element (2, 3) has two shells (21, 22, 31, 32), each shell having a margin (210, 220) defining an access opening giving access to the inside of the shell, said packaging element (2, 3) having at least a “closed” configuration in which the shells form a chamber that is substantially closed and that is suitable for receiving an article, such as a medical implant. The packaging element (2, 3) further has a sealing strip (4) that extends, outside the shells (21, 22, 31, 32), over the entire length of the margins (210, 220) of the shells of the packaging element, and from one margin (210, 220) of the shell to the other margin (220, 210) of the shell in such a manner as to seal the chamber defined by the two shells. An assembly has two packaging elements received one inside the other, with a corresponding sealing method.
