The ZULU Goals Stainless Steel 64oz Half Gallon Water Bottle helps you reach your hydration goals. Its large half gallon capacity lets you drink all day with fewer fill-ups . and vacuum insulated stainless steel keeps drinks cold all day! A silicone straw spout keeps the drinking surface clean. The leak-proof quick access Simple Flip Lid doesn’t require threading and completely covers the straw so it stays clean.