Using this water bottle carrier bag is a breeze. First, attach the adjustable and detachable strap to your preferred length. Slip your 40oz tumbler into the main part of the bag. Then, you can put your phone, keys, and ID cards in the detachable pouch or the small pocket. When you're in the car, just place the tumbler with the bag on it into the cup holder. As for maintenance, you can spot - clean the polyester fabric with a mild detergent and a soft cloth. Make sure to dry it thoroughly. Remember, the color in the preview images might be a bit different from the real thing, so don't be surprised if there's a slight variation. Also, check the zipper regularly to ensure it's working properly to keep your personal items safe.