If you’re serious about staying hydrated, the Iron Flask 64 oz Narrow Mouth Bottle With Spout Lid has your back. Made from high-grade stainless steel, this double-walled vacuum insulated bottle keeps your drink cool as a cucumber for 24 hours or piping hot for 12 hours with no bottle sweat. The leak-proof spout lid and narrow mouth make it easy to chug and worry-free when stashed away in your bag. And we included a flip lid and a screw-on lid ‘ so you can switch them around depending on the day’s activity.