backpack
noun [ C ] uk/ˈbæk.pæk/ us/ˈbæk.pæk/ (also mainly UK rucksack)
（尤指徒步旅行或登山时背的）旅行包，背包
a large bag used to carry things on your back, used especially by people who go camping or walking
It's a frame backpack with a belt and padded shoulder straps. 这是一款带有支架的背包，配有可束在腰间的带子，肩带衬了软垫。
backpack
verb [ I ] uk/ˈbæk.pæk/ us/ˈbæk.pæk/
背包旅行;野外露营
to travel or go camping while carrying your clothes and other things that you need in a backpack
We backpacked around Thailand. 我们在泰国背包旅行。