attaché case vs travel bag

attaché case

noun
  • A box-style briefcase, scrunched over a hinged frame that opens into two compartments. 

travel bag

noun
  • A light bag or case, smaller than a suitcase, for carrying toiletries and similar articles when travelling. 

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