The slim alternative: the Leuchtturm1917 Hardcover Ruled Master Slim Notebook. The Master Slim is larger than A4 and can hold loose sheets between the pages and in the expandable pocket without the edges protruding. This handsome and handy notebook features 100 g/m² paper and has 121 numbered pages. The Master size features lines with a generous spacing of 8.5 millimeters and an extra margin with space for comments.