The weight of an empty backpack could probably be measured in grams. However, a filled backpack would best be measured in kilograms.
Well it depends on what's in the backpack, what brand it is and how big it is. Hope this helped!
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Grams
A gram is measured in grams. A kilogram is measured in kilograms.
Matter can be measured in either grams or kilograms or a combination of both.
kilograms
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Grams
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Grams
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kilograms! its obviously to big for grams