Sketch paper is meant for large, quick sketches in dry media, without much detail. They aren’t usually meant to be permanent. So sketch paper is usually wood-pulp based, thin and cheap, and sold in large, thick pads. If you want your sketches to last, choose acid-free sketch paper, and if you prefer a thicker paper, choose a heavier weight, at least 125 grams per square meter (gms) or 80 pounds. Check the dimensions to be sure you get the right size for your work.