Nanovessel is a 3-in-1 vacuum insulated flask - Tumbler, Tea Infuser and Water Tank - Food grade and made of stainless steel 304, it keeps your beverage hot or cold long enough to preserve all flavors and freshness. Equipped with a filter mesh, you can brew your tea directly in it. The twist off lid and filter element are easy to remove and clean. Nanovessel is sized to fit most automobile cup holders. Most importantly, Nanovessel is 100% compatible with Nanopresso. Don't waste time to pour hot water from vacuum flask into Nanopresso water tank. The Nanovessel can be mounted directly onto the Nanopresso and used as a large insulated water tank. Nanovessel is the perfect add-on to your Nanopresso.