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.
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Most people in Britain or the British Isle's call it a rucksack. Some do use Backpack as well.
So, the name rucksack refers to a type of bag used by British people. The Americans, on the other hand, use the term backpack to refer to the same thing as the British.
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 waist bag, fanny pack, belt bag, moon bag, belly bag (American English), or bumbag (British English) is a small fabric pouch worn like a belt around the waist by use of a strap above the hips that is secured usually with some sort of buckle.
A rucksack is another name for a backpack or knapsack. On the first day of school, you might load up your rucksack with new notebooks and sharp pencils.