The Classic 27oz (800ml) is our original stainless steel water bottle designed for kids and adults with easy hydration in mind. Single wall design is lightweight and easy to bring anywhere. Klean Coat powder coat finish is 4X more durable, chip-resistant and safe for people and planet. 18/8 Stainless Steel construction. Klean Coat powder coat finish is 4X more durable than our previous finish and formulated for human and environmental health (Brushed Stainless has no coating). Electropolished interior, a safe & non-toxic process, and rounded corners make it easy to clean. Includes spill proof, high flow Sport Cap 3.0. Cap is not designed to be leakproof. Compatible with all Classic Caps, including the leak proof Loop Cap & plastic-free Bamboo Cap. Backed by the lifetime Strong as Steel guarantee.