Here is the list of goods prohibited by La Poste Colissimo :

• Dirty, dangerous, prohibited products, in particular counterfeit articles, contrary to the laws and regulations in force, in particular labor law, and/or which, by their nature or their packaging, are likely in particular to injure La Poste agents or damage other objects or La Poste machines. hazardous materials such as, but not limited to, gases, ammunition, flammable, radioactive, biological, toxic or corrosive materials.
• Legally defined fund objects and securities (in particular precious metals, bearer bonds and fiduciary securities). Jewelry possible only by registered mail.
• Human ashes and funerary relics.