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Yes. That is the correct spelling of rucksack. It means a knapsack or backpack.
the word rucksack is from the German language
A synonym for rucksack is knapsack.
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Also 'backpack' (may be hyphenated).
Mit Rucksack und Harpune was created in 1985.
A rucksack or (backpack, haversack, knapsack, packsack) is a bag carried by a strap on your back or shoulder.