I bought 3 for my son to start school with. His list was specific saying they had to have STURDY covers. I was afraid I wouldn't be able to find what was needed or worse they would be sold out! I am very pleased and will return again and again for more as needed!
Have one for each topic. I label the outside and then when I have thoughts or notes on that subject I pick it up and write in it. It helps me keep organized and write things under the right topic instead of writing all my thoughts in one book. When I write or correspond on that subject I merely grab that book and it is all in front of me.