The internal material of the insulated bottle is made of stainless steel.This material is Durable,Easy to clean,No smell,Can be used with peace of mind.Make a positive contribution to your health. 【Material】Double layer stainless steel, the inner tank is 304 stainless steel, and the shell is 201 stainless steel 【Weight】0.85 lbs, 0.92 lbs 【Capacity】20oz (600ml), 30oz (900ml) 【Features】Classic stainless steel natural color, easy to carry, heat preservation and cold lock, double drinking cup lid 【Heat preservation】6-12h Packing List: 1*Stainless steel Vacuum Flask Note: 1. Because the environment is different, the holding time may not be the same as described. 2. Manual measurement of length, there may be 0-1.2in length error. 3. Due to the shooting environment, shooting equipment and display equipment, there may be color difference. 4. If you cannot accept the above discrepancy, please do not place an order casually. Food Grade 304 Stainless Steel Water Bottles: BPA Free, Non-toxic, Eco-friendly, No metallic taste, safe and healthy for all your hydration needs.Choose our insulated water bottle for a stylish, practical, and sustainable way to stay hydrated all day. Double Wall Vacuum Water Bottle: Keeps your drink ice cold for up to 24 hours and hot for up to 12 hours.Leak proof and dust proof design ensures the beverages stay securely contained.Non-sweat exterior prevents condensation and keeps your hands dry. Perfect for a variety of scenarios: The metal water bottle is ideal for everything from camping trips to morning commutes,suitable for hiking,picnics,outdoor sports, gym, work, school or daily use at home. Various Sizes and Colors to Choose: Available in 20 and 30 ounce sizes, making it easy to find the perfect size for your needs and choose the one to match your style from a variety of vibrant colors. Easy to carry and clean: All these 2 sizes water bottles fits your cup holder and fit in most backpack pockets making them easy to take anywhere and a reliable hydration solution for you to stay hydrated.