Stay out longer with the double-walled and vacuumed insulated AdventureTemp Flask. The rugged puncture resistant build, o-ring seal and screw-on top is ready for the most bone-rattling terrain, giving you the freedom to choose your own adventure. Tough double-walled stainless steel construction Vacuumed insulation keeps cold drinks cold and hot drinks hot, for hours Holds 20oz / 600ml of your favorite beverage High-quality 18/8 stainless steel for durability and longevity Corrosion resistant Puncture resistant Leak-proof stainless steel and bamboo top with alloy handle and o-ring seal Fits most vehicle cupholders Safe Food Grade stainless steel Easy to carry by hand, backpack, or other gear Wide mouth for easy filling, drinking and cleaning Naturally BPA free Care:Rinse and wash before using.1. Clean with warm water and mild dish soap. Rinse thoroughly with hot water.2. DO NOT clean your flask in the dishwasher.3. To remove difficult stains, fill your flask with hot water, add one teaspoon of baking soda. DO NOT put stopper/top on the flask while using this cleaning method. Dont be a science fair failure.4. Use a soft cloth. Avoid using scrubbing/scouring products. They will scratch your nice, new flask.FOR THE BEST TEMP KEEPING RESULTS: pre-fill the flask for 3 minutes with hot water for hot drinks, or cold water for chilled drinks. Get that flask to temp so your drinks dont have to!