pencil case vs pencil holder

pencil case

noun
  • An object purposed to contain different stationery like pencil, rubber, correction fluid, etc. 

pencil holder

noun
  • A small opened container for stationery such as pencils, ballpoint pens, rubber, correction fluid, etc. 

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