UMAI Insulated Stainless Steel Water Bottle with Bamboo Lid 500 Ml |Non-Toxic & BPA Free Water Bottle for Home Office Kids| Hot for 18 Hours,Cold for 24 Hours|Rust-Free & Leak-Proof Bottle HOT AND COLD STEEL WATER BOTTLE 1 Litre: Our insulated steel water bottle 500 ml comes with a double wall technology that keeps your water cold for 24 hours and hot for 18 hours so that you can sip through the day without worry. It can also be used as a flask for tea, coffee or other beverages LEAK-PROOF AND EASY TO USE: This flask 500 ml bottle ergonomic design, shatter-proof and leak-proof features make it the perfect companion that will keep you hydrated on the go FAMILY SAFE & ECO-FRIENDLY: Our 8/18 304 Food Grade Insulated Stainless Steel Bottle 500 ml is Rust-free and super durable. Our insulated stainless steel bottle is the ultimate sustainable choice for your family and can be reused everyday without any waste. DAILY SOURCE OF SUSTAINABLE HYDRATION: UMAI Flask 500 ml is BPA free and helps keep you and your family hydrated without worrying about any bacterial development or toxic substances leaking into your water unlike plastic bottles.