hydro flask vacuum insulated stainless steel water bottle wide mouth with straw lid (pacific, 40-ounce) hydro flask hydro flask wide mouth with straw lid bottle utilizes tempshield double wall insulation to keep cold drinks colder and hot drinks hotter for longer. featuring a convenient straw lid, this 40 ounce bottle is made of pro-grade stainless steel for superior durability. an easy-grip, sweat-free design makes the bottle perfect for use during workouts.