Using this crossbody chest bag is a breeze. First, adjust the strap to your desired length for a comfortable fit. You can wear it over one shoulder or across your body depending on your preference. To store your items, simply unzip the bag and place your things inside, then zip it up securely. When it comes to maintenance, if the bag gets dirty, you can use a damp cloth to gently wipe the surface. Avoid using harsh chemicals as they may damage the waterproof coating. Also, make sure to fully dry the bag after it gets wet to prevent mold. Keep the zipper clean and lubricated with a small amount of wax to ensure smooth operation.