Using this tumbler is easy. Just open the lid and pour in your favorite hot or cold drink. You can take it with you on hikes, to work, or while running errands. Remember, when you fill it with hot water, the steam might cause the lid to lift a bit, but that's okay. To maintain it, wash it with mild dish soap and warm water. Avoid using abrasive cleaners as they could scratch the surface. And that's all you need to know to enjoy your new tumbler!