The Hydro Flask 40 oz Wide Mouth stainless steel water bottle is made for serious hydration and liquid storage. Whether you're walking into an intense workout or simply trying to get through a day in the office, the 40 oz water bottle will do the job. The larger mouth opening makes the 40 oz a great option for mixing sports drinks or storing smoothies, and our double wall vacuum insulation ensures that cold liquids will stay cold for up to 24 hours, while hot liquids remain hot for up to 6. The 18/8 food-grade stainless steel interior is non-porous, preventing residual bacteria buildup and hints of yesterday's beverage. Our insulated Wide Mouth Flat Cap further protects your liquid cargo from the elements, and is made from recyclable BPA-free PP#5. Like all Hydro Flasks, the 40 oz is backed by our lifetime warranty. Look for the H-guy and Hydro Flask logo to ensure you're getting the market's premium insulating beverage bottle.