The Klean Kanteen Kid Classic Sippy 12oz water bottle is the perfect progression from the Klean Kanteen Baby Bottle and 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. Sippy Cap is made of BPA-free polypropylene #5, features a removable valve for easy cleaning and is spill proof. 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 Kid Classic Sippy 12oz water bottle easy to clean and maintain. All Klean Kanteen products are made using safe healthy materials and backed by the Strong as Steel Guarantee. Hand washing recommended for color bottles.