I've used this several times for winter mountain climbing, keeping it in a Thermos insulated case. Please understand this and accept it with no claims and no returns. The photos are everything. Specifications: 【Material】Body: (Outer) SUS304 Stainless Steel, (Inner) SUS316 Stainless Steel Outer stopper: Polypropylene Inner stopper: Polypropylene Packing: Silicone rubber 【Weight】354g 【Color】Red (RD), Stainless Steel (STNLS) 【Size】Φ7.6 x 29.1cm 【Capacity】0.9L 【Heat resistance/Cold resistance】(Inner stopper) 100℃ / -20℃ (Outer stopper) 100℃ / -20℃ (Packing) 150℃ / -40℃ 【Heat retention/Cold retention (Room temperature 20±2℃)】 Heat retention: (Start) 95℃ (After 6 hours) 81℃ or higher Cold retention: (Start) 4℃ (After 6 hours) 7℃ or lower 【Kitchen appliance compatibility】 Dishwasher: Only the cup and packing are usable. The inner stopper and bottle body are not usable. Microwave: Not usable.