Using the Klein Tools 5139L bag is super easy. Just unzip it, and you can start putting in your tools like pliers, wrenches, and screwdrivers. Make sure to arrange them in an order that makes it easy for you to find what you need later. When closing the bag, give the zipper a firm tug to ensure it's fully closed. As for maintenance, keep it away from sharp objects that could scratch or tear the leather. If it gets dirty, use a soft, damp cloth to gently wipe the surface. Don't soak the bag in water or use harsh chemicals. Store it in a dry place when not in use to keep the leather in good condition. And always handle the zipper carefully to avoid any damage.