A "backpacking trip" refers to a journey that involves carrying your belongings in a backpack while exploring different places, typically in nature. Full definition
I like everything to do with the outdoors so this summer we went on backpacking trip in Yosemite which was terrific. (kidsinthehouse.com)
I first caught the travel bug during my first solo backpacking trip through Europe back in 2008. (lashworldtour.com)
Whenever I get the chance I go on backpacking trips in the mountains of British Columbia or catch the latest film from Zhang Yimou, the Coen Brothers, or Deepa Mehta. (scientificamerican.com)