Using this water bottle carrier bag is a breeze. First, adjust the strap to your preferred length according to your body size. You can set it anywhere between 24 - 48 inches. Then, place your 40oz tumbler or water bottle in the main part of the bag. For your personal items like phone, keys, ID cards, or bank cards, put them in the appropriate pockets. The detachable pouch can be used to carry small essentials separately. When it comes to maintenance, simply wipe the polyester fabric with a damp cloth if it gets dirty. Since it's made of durable polyester, it can withstand normal wear and tear. Also, keep in mind that the color of the actual item might be a bit different from the preview images because of the lighting during the photoshoot or your monitor's display.