Using the Serfas Waterproof Handlebar Barrel Bag is easy. First, use the two velcro straps to attach it to your bike's handlebar. Then, use the bungee cords to secure it to the steerer tube. You can also add a shoulder strap at the attachment points for carrying it off the bike. When packing, put your items like jackets, gloves, or snacks inside. Remember not to overfill it to keep the bag balanced on the bike. For maintenance, clean it with a mild soap and water after use, especially if it gets dirty or wet. Let it dry completely before storing it in a cool, dry place.