I've not had a yellow notebook for a long time, but in my view right now I have 5 stacks of yellow sticky-pads (aka post-it notes), some of which are A5, notebo

I've not had a yellow notebook for a long time, but in my view right now I have 5 stacks of yellow sticky-pads (aka post-it notes), some of which are A5, notebook sized. When I buy cheap recycled-paper notebooks the paper is often off-white and has a yellow look to it. At least to me; yellow implies disposability or cheapness.