The Damuge Bamboo Thermos combines a natural bamboo exterior with a double-wall vacuum stainless steel interior for exceptional heat and cold retention. Available in three sizes — 350 ml, 450 ml, and 500 ml — this insulated flask keeps your drinks hot for up to 12 hours and cold all day. BPA-free and toxin-free, it is a sustainable alternative to plastic bottles. Lightweight and portable, it fits in any bag or backpack for commuting, hiking, travel, or desk use. The leak-proof lid and wide-mouth opening make filling and cleaning effortless. A zero-plastic design for the eco-conscious traveler. Ships worldwide. Free shipping included.