Tolong buatkan teks what’s in my bag

I have a favorite thing, a bag. It colors are dark and brown. It's very beautiful. There is also the picture of brown bear in front of my bag.
In my bag I put many things like books, my cute pencil case, or anything else. I always bring it to school except on Sunday. I really love my bag

I left my bag at school. My bag was very heavy the next day when U carried it home. It's wierd but you feel as if the bag is going to comsume you. What's making my bag so heavy? What's in my bag?