Using this water bottle carrier bag is a breeze. First, adjust the strap to your preferred length for comfortable carrying. Place your 40oz tumbler or water bottle in the main part of the bag. You can store your phone, keys, ID cards, and bank cards in the detachable pouch and small pocket. When you're in the car, the bag - clad tumbler can be put in the cup holder. As for maintenance, simply wipe the bag with a damp cloth to keep it clean. Remember, the color of the actual product might be a bit different from the preview images due to lighting and monitor settings.