The Klean Kanteen Classic water bottle is the original, iconic, full stainless steel water bottle designed to last a lifetime. Created as a safe, BPA-free, nontoxic alternative to plastic water bottles over 10 years ago. Crafted from high quality, durable food grade 18/8 stainless steel with a wide 1.75 inch (44mm) opening which is easy to fill, pour and drink from. Single wall stainless steel construction is lightweight, perfect for hydration and keeping drinks cold in the cooler or in the fridge. Electropolished interior and rounded corners make the Classic water bottle easy to clean and maintain. The Classic 18oz is small enough to easily fit in a purse or small backpack and perfect for short hikes and trips around town. The Classic 27oz is Klean Kanteens most popular water bottle size and also fits an entire bottle of wine, because camping is better with adult beverages. The Classic 40oz is a favorite for outdoor enthusiasts and anyone who takes hydration serious due to the large capacity and light weight. All Klean Kanteen products are made using safe healthy materials and backed by the Strong as Steel Guarantee. Hand washing recommended for color bottles.