背包用英语怎样说

bag 高级一点的是backpack 至于其他人说的也对 但有的不常用 有的专指跨肩包 你问的是书包那种的吧

knapsack；rucksack；infantry pack
三个都是

我刚查过词典是knapsack

You can say just "bag",but if you want to describ a special bag item, you can say "backpack" or "rucksack ", which mean "a large bag used to carry things on your back, used especially by walkers and climbers".

knapsack; pack

bag