Using the Topeak TopLoader 0.75L black top tube bag is super easy. First, mount it securely on your bike's top tube. You can put all your small essentials like energy bars, phone, wallet, and tools inside. When you're riding and need something, just reach over and open the bag. As for maintenance, keep it clean by wiping it with a damp cloth regularly. Avoid using harsh chemicals as they might damage the bag. Also, don't overfill it to prevent the bag from getting strained and losing its shape. When not in use, store it in a dry place.