Daruma (Yokota) 201 White
Daruma is a household name for thread in Japan. This 'thin' sashiko thread is a 4-ply which is in between the Olympus 'fine' (3-ply) and ordinary (6-ply) ranges. This makes it really versatile as you can stitch fine details easily, or double it up if you want a thicker thread.
Another feature is that the thread comes wound on a card, so it is easy to measure and cut your desired amount without the risk of getting in a tangle. The cards can then be stored away neatly, taking up very little space. Each card contains 40m of thread.