It's important to consider paperweight in a work notebook to prevent any ink bleeding or ghosting on pages. A useful way of determining paperweight is to see what a notebook’s GSM (grams per square meter) is, which measures paperweight. Considering that copy paper is usually around 75gsm, according to Xerox, you should look for a slightly higher number when choosing your work notebook. The higher you go, the thicker and heavier the paper will be.