Using this chest bag is a breeze. Just adjust the strap to your preferred length and put on the bag across your chest. You can store your phone, wallet, keys, and other essentials in the inside and outside pockets. For the inside zip pocket, it's great for keeping small, valuable items safe. The open pocket can hold things you need to access quickly. When it comes to maintenance, you can spot - clean the bag with a mild detergent and a soft cloth. Avoid machine - washing or soaking the bag as it may damage the fabric and zippers. Also, keep it away from sharp objects to prevent tears. If you're not using the bag for a long time, store it in a cool, dry place.