A rucksack is a bag that you wear on your back. People call it a backpack too. 'My school bag's a rucksack and it's always really heavy. '
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The word 'rucksack' comes from Germany and the term is frequently used in Western military forces, such as those in the UK and US. 'Rucking' is one of the most common military activities and so it's clear to see how rucksacks get their name.
A backpack is a bag worn on your back and typically has two straps over the shoulders. A rucksack is a specific backpack most often used for hiking or camping. It is larger than a backpack and usually has a frame to support the bag's weight.
A backpack can be checked luggage if it is small enough to fit into the overhead bin or under the seat in front of you. Backpacks are also often used as carry-on luggage.