This bottle is designed for Smoothies and protein shakes. The flip top lid makes it ideal for thick straws and or to drink thicker liquids. The 304L grade stainless steel safely accommodates acidic liquids without causing corrosion to the interior of the bottle. Extra wide mouth makes cleaning extremely easy. This bottle comes with a flip top and a twist off lid. 304L Primary Grade Stainless Steel Water Bottle. Intended for cold/room temperature liquids only. Not recommended for hot liquids. Thermal cozies are a must have item for stainless steel water bottles. Infinite Soulutions Neoprene Thermal Cozies will keep water colder longer, prevent condensation from forming on the outside of bottles, help to protect bottles against damage and come with convenient detachable hiking straps for hands free carrying. Save 10% on a Thermal Cozy when bundled with a bottle using the drop-down above.