Choose the size carefully according to the final trim dimensions, printer limits, folding plan, storage method, and intended binding edge. Weight affects stiffness, opacity, handling, and the amount of space each sheet occupies in the finished spine. Unpunched binding paper includes practical size and weight options for documents that need later customization. A lighter sheet may suit large internal sets, while a heavier sheet can provide a firmer section divider or presentation feel. Include covers, tabs, and inserts when estimating the completed thickness. The printer, cutter, folder, and punch must all accept the chosen paper without curling, cracking, or misfeeding.