This thermos flask stands out for its refined design and sturdy construction. Its smart filter system makes it truly unique: instead of being fixed inside the flask body like most, the filter is attached to the lid. This allows you to brew tea directly in the flask and stay in full control of the steeping time, without worrying about bitterness from oversteeping. Smart Design For Hot & Cold Drinks This versatile thermos works as both a tea maker and a flask. You can brew loose-leaf tea right in the bottle with the magnetic filter, then take it out when you want to use the flask for other drinks. It keeps drinks hot or cold for hours, so it’s handy whether you’re at home, at work, or on the go. How to use? Add tea leaves to the magnetic filter. Pour hot water into the thermos and close it with the lid. Turn the flask upside down to let the water flow through the filter and steep the leaves. The lid's top is flat, allowing you to place it upside down on the table if needed. When the flavor is just right, place the flask upright, remove the lid with the filter, and enjoy a crystal clear, balanced brew. Leak-proof & Insulated The leak-proof seal prevents spills, while the lid serves as a small bowl for the used leaves. Practical and thoughtfully designed, this tea maker and thermos is a great choice for anyone who wants to enjoy loose-leaf tea or other hot and cold drinks everywhere, all with one flask. Material: stainless steel 304 and 430, modified PCT plastic (BPA free), silicone rubber Content: 400ml Measures: 21.6x6.5cm Dishwasher Safe: No Microwave Safe: No Brand: Samadoyo Model: C013A Color: Black