Fits:
2-3 textbooks
Paperback books
1 large binder
2-3 spiral notebooks
Calculator
Pens and pencils
Bag lunch
Cellphone
MP3 Player

Fits:
3-4 textbooks
Laptop computer
1-2 large binders
Paperback books
Spiral notebooks
Calculator
Pens and pencils
Bag lunch
Cellphone
MP3 Player
Sweatshirt

Fits:
3-5 textbooks
Laptop computer
1-3 large binders
Paperback books
Spiral notebooks
Calculator
Pens and pencils
Bag lunch
Cellphone
MP3 Player
Gym clothes
Sweatshirt