To use this chest bag, simply open the buckle and put your daily essentials like your phone, wallet, and keys inside. Wear it across your chest for easy access. When it comes to maintenance, use a damp cloth to clean the canvas if it gets dirty. Avoid exposing it to extreme heat or moisture to keep the material in good condition. Also, make sure not to overstuff the bag as it might damage the buckle or the shape of the bag.