Using this tumbler is easy. Just open the lid, pour in your favorite drink, and you're ready to go. It's great for taking your tea, coffee, or other beverages with you during your daily activities. Remember, when you fill it with hot water, the steam may lift the lid a bit, that's normal. To keep it in good shape, wash it with mild dish soap and warm water regularly. Don't use abrasive cleaners as they can scratch the surface. Also, make sure to dry it thoroughly before storing to prevent rust.