packaging vs sheathing

packaging

noun
  • The materials used to pack something. 

  • The industry that produces such material. 

  • The manner in which a person or product is promoted. 

  • The act of packing something. 

sheathing

noun
  • Something that wraps around or surrounds something, as a sheath encases its blade. 

How often have the words packaging and sheathing occurred in a corpus of books? (source: Google Ngram Viewer )