Space-saving foldable notebook box for school backpacks: School notebooks have to endure quite a bit in everyday school life. They are packed into bags multiple times a day, sometimes more gently and sometimes less so, may bend in a nearly empty backpack, encounter a forgotten banana or a spilled bottle, and often look worn out 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, writing pads, 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 couldn't be 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 conventional notebook boxes and closed notebook folders, which have a fixed size, the foldable notebook box saves space.