Press Packer Siena's bag was so heavy she started getting back pain and had to see a specialist.
Here's her story about what happened.
"My back started to hurt when I changed schools.
At my new school my classroom was on the top floor and every morning I had to carry a very, very heavy book bag up the stairs filled with all my books for the day.
Maybe there were eight books plus my notebooks so I was carrying kilos of weight!
The weight of this bag began to put strain on my shoulders and then my back started to ache.
I asked my mummy if there was anywhere I could get help as there was no way to carry around fewer books.
My mummy suggested I go to a chiropractor that she knows.
When I got there Laurie the chiropractor took a look at my back and soon worked out what the problem was.
She made some strange clicking noises in my back and neck.
When she finished it took a little bit of time to stop feeling sore but sure enough, it did work.
She told me to come and see her in two weeks time and did a few more things.
She also asked me to ask the teachers if I could come and get the books I needed for my next lesson every break time and leave the rest in my locker.
My posture has definitely changed and thank goodness I am not on the top floor this year."
Siena, 10, London
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