The main function of the packages in question is to guarantee the materials adequate mechanical protection against external and internal stresses during the handling, transport and storage phases. Wood packages shall have heads, sides, lid and fastenings applied with screws to guarantee the package reopening and consecutive rebuilt without damages (e.g., applicable for re-preservation activities). This requirement must to be applied for all packages with gross weight lower than 6000 kg. For packages with gross weight between 6000 kg and 15000 kg must be screwed only the lid, for packages with gross weight above 15000 kg nailing is required.