The present invention relates to an implant system comprising implantable material in at least partially uncured form, contained in a closed casing, under vacuum and sterilized, and a closed bag containing the casing. The system is characterized in that at least 5% of the surface of the casing comprises sheet-like material having a thickness of 0.05-5 mm and having an original form, the sheet-like material being selected from the group consisting of metallic materials, polymers, bioceramic materials and composites thereof, provided that the material, once deformed from its original form to a changed form, is capable of maintaining that changed form unless subjected to external forces.