Using this tumbler is easy. Just open the lid and pour in your favorite drink, whether it's hot tea or cold lemonade. When you're ready to go, close the lid tightly. Remember, if you fill it with hot water, the steam may cause the lid to lift a bit, but that's normal. To maintain your tumbler, wash it regularly with mild soap and warm water. Avoid using abrasive cleaners that could scratch the surface. Keep it in a dry place when not in use, and it will serve you well for a long time.