I read a very good post about going the analog way (How analog rituals can amp your productivity) and this was my tool. I could have gone the Moleskine way (I have a pair of 7 odd cm sized pocket notebooks), but this is way cheaper and more handy. When you need one, you only need a A4, it can even have a side written up!
Also, when you finish your notebook, you can unfold it and fold it reversed to have another use!
You will need an A4 (or any other size) paper and scissors.
Winning Against Your Reading List
Book review: How to be #1, by Vince Lombardi