Using this tumbler is super easy. Just open the lid, pour in your favorite drink, whether it's hot coffee or cold juice, and you're good to go. When filling it with hot water, be careful as the steam might lift the lid. It's not a problem, just a natural occurrence. To keep your tumbler in great shape, wash it with mild dish soap and warm water regularly. Avoid using abrasive cleaners as they can scratch the surface. This tumbler is designed to be durable, so with proper care, it will serve you well for a long time.