A pocket notebook

Fold four sheets in half and nest one inside another. Open the booklet at the middle and mark three holes along the crease. Place a scrap of cardboard under it before piercing the marks.

Start from the middle hole on the inside. Stitch to one end, across to the other end, then return to the middle. Tie the ends around the long inner stitch. Press the closed booklet under a book to set the fold.