Using your Hydro Flask 28 oz Laguna All - Around Tumbler is easy. First, open the Closeable Press - In Lid by sliding it open. You can either drink directly from the tumbler or use a reusable straw. Fill it with your favorite hot or cold beverage. When you're done, slide the lid shut to keep the temperature and prevent spills. As for maintenance, you can safely put it in the dishwasher thanks to the Color Last powder coat. However, to keep it in top condition, avoid using abrasive cleaners. Also, remember that this tumbler is made of 18/8 pro - grade stainless steel, so it's durable, but don't drop it from a great height to prevent dents. And since it's BPA - Free and Toxin - Free, you can enjoy your drinks worry - free.