Here is an object that I really like to make: cut, weigh, fold, unfold, staple, fold, recut, tweak. Patience needed!
The covers are printed at a professional printer near me, on Nautilus 250g / m2 recycled paper.
Notebooks with flaps : Inside: 30 pages / 80g recycled paper. The cover flaps allow to mark a page, and to protect and reinforce the notebook.
Simple square notebooks : Inside: 24 pages / 80g recycled paper.