Hydro Flask 18oz Insulated Food Flask. From hot soups to frozen smoothies, it keeps your favorite foods at the perfect temperature. And professional-grade stainless steel means it won’t retain or transfer flavors. TempShield™ insulation keeps cold foods cold and hot foods hot. Durable 18/8 Pro-Grade Stainless Steel construction. BPA-Free and Phthalate-Free. Secure lid for easy grab and go refueling. 18 oz. Imported.