billfold vs shopping bag

billfold

noun
  • A small, folding sleeve or case designed to hold paper currency, as well as credit cards, pictures, etc. 

shopping bag

noun
  • A strong bag with handles used to put purchases in; usually made of plastic, paper or fabric, sometimes given away with a purchase. 

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