your mom is the answer :p
The German word for book bag is "Buechertasche".
la mochila is how you say book bag in spanish
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Bolsa de libros is "book bag"; you can also put your books in a mochila, a knapsack/backpack.
A backpack is exactly the same thing. A book bag is not just for books you know.
what year was the book bag invented
it is called "the magic bag in a hat".
If the bag was 4.712kg and a 1.34kg book was removed, the weight would now be 3.372kg.
book-bag, or book bag. it is two words, but it can be one if you use a little slash-y thing.
With your hands
"Knowledge carrier"
a fulcrum.