backpacker
Concise Oxford English Dictionary © 2008 Oxford University Press:
backpack/ˈbakpak/
▶noun a rucksack. ▶verb (usu. as noun backpacking) travel or hike carrying one's belongings in a rucksack.
– derivatives
backpacker noun.
backpacker noun.
'backpacker' also found in these Oxford entries:

