Space-saving foldable notebook box for the school backpack: School notebooks have to endure quite a bit in everyday school life. They are packed into the bag multiple times a day, sometimes roughly, and may get bent in an almost empty backpack, experiencing the occasional forgotten banana or spilled bottle. Often, they look quite worn shortly after the school year begins. You can equip your child's school backpack with the notebook box, so the expensive, once carefully covered notebooks remain usable for longer. This way, school notebooks, as well as binders, notepads, and softcover books in A4 format, have their own secure place. The compartments can even be divided into several colored sections, making it immediately clear where to look for a specific notebook. An extra compartment for a ruler keeps the 30 cm ruler safe from breaking. Keeping order in the backpack has never been easier! The attachment of the notebook collector is done using clips on the book compartment of the school backpack. A new compartment can thus be added in no time, which can be expanded or contracted depending on the contents – similar to an accordion. Unlike traditional notebook boxes and closed folders that have a fixed size, the foldable notebook box saves space.