TriPly Vacuum Technology TPVT Between two steel layers sandwiched a thicker aluminum sheet instead of just thin copper coat for superior temperature control in the flask Versatile Eco Friendly Suitable for keeping water coffee tea and other drinks hot or cold for up to 24 hours making it a versatile companion for home workouts gym sessions picnics and other indoor and outdoor activities Choose an ecoconscious lifestyle with our BPAfree and reusable flask and reduce singleuse plastic waste High Quality 304 Steel Easy to clean keeping your beverages safe our flask features a smooth shiny surface thats highly durable ensuring it wont crack over time Portable and Convenient Design Its travelfriendly design makes it a versatile companion for daily activities fitting easily into bags backpacks or car cup holders due to its lightweight and portable Jute Bag Complimentary jute bag adds convenience for carrying your bottle anywhere office home picnics outdoors camping for personal use and gifting