Loden cloth is basically easy to process and far more dimensionally stable and resistant than felt cloth. Furthermore loden cloth is cheaper than felt cloth because you have to use less material during the process (lower material strength). Both materials are available in almost every colour. Felt cloth gets produces from pure wool which is combed and milled yet not weaved. By compressing with water the material occurs very dense but not particularly stable. Loden cloth consists of spun wool which is weaved and milled. Due to the weaving process the material reaches a high resistance as well as stability.
Also Walter Benjamin loved notebooks
What constitutes the fascination of notebooks?