Space-saving foldable notebook box for school backpacks: School notebooks endure a lot in everyday school life. They are packed into bags multiple times a day, sometimes more gently than others, may get bent in a nearly empty backpack, and encounter the occasional forgotten banana or spilled bottle. Often, they look worn shortly after the school year begins. You can equip your child's school backpack with the notebook box, ensuring that 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 notebook collector is attached using clips to the book compartment of the school backpack. A new compartment can thus be added in no time, and it can be expanded or compressed depending on the contents—similar to an accordion. Unlike traditional notebook boxes and closed notebook folders, which have a fixed size, the foldable notebook box saves space.