1. 帆布背包：ruckle 弄绉 | rucksack 帆布背包 | ruckus 喧闹

2. 背包：Suspenders吊带 | Rucksack背包 | Toe鞋头

3. 背囊：knapsack 旅行用帆布或皮制背包 | rucksack 背囊 | haversack 小帆布背囊

1. （登山或远足时用的）背包，旅行包
    A rucksack is a bag with straps that go over your shoulders, so that you can carry things on your back, for example when you are walking or climbing.

noun

1. a bag carried by a strap on your back or shoulder

    Synonym: backpackback packknapsackpacksackhaversack