backpacking vs round trip

backpacking

noun
  • hiking and camping overnight in backcountry with one's gear carried in a backpack. 

  • low-cost, generally urban, travel with minimal luggage and frugal accommodations. 

round trip

noun
  • A trip from one destination to another and then returning to the starting location. 

  • The investment of a borrowed overdraft in order to make a profit in the same market. 

  • The export and eventual reimport of a file, data, etc. without loss of fidelity. 

  • In an oil-drilling operation, the raising, disassembly and replacement of the drilling equipment. 

  • A form of barter that involves the sale of an unused asset and the purchase of the same asset back again, or a similar one, typically used in accounting fraud. 

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