Iron Flask Narrow Mouth Bottle with Straw Lid, Dark Rainbow, 64oz/1900ml. The Iron Flask 64 oz Wide Mouth Water Bottle With Spout Lid is the perfect heavy duty companion for running around town, running at the gym, or running the world at the office. With our broad array of colors, you can rock a bottle that reflects your personal style, while the double-walled, vacuum-insulated stainless steel keeps your drinks cold for 24 hours and hot for 12 hours with no sweat. We included a flip lid and a stainless steel screw-on lid apart from the straw lid, so you can be the master of your drinking ways.