The 18 oz Classic water bottle is a stainless steel bottle designed for kids and adults. with quick hydration in mind. Single-wall. non-insulated design is lightweight. small. and easy to bring anywhere. Made with certified 90% post-consumer recycled 18/8 stainless steel. featuring our chip-resistant Klean Coat finish that's durable and made for people and planet. The 18oz size features a narrow profile for easier gripping. packing and carrying. 100% leakproof Flip Seal Sport Cap comes with an ergonomic spout that opens and closes with just a flick of the thumb and can be used with or without the included stainless steel straw for maximum versatility. Great for running. biking. hiking. fitness and your active lifestyle.