Hydro Flask 20oz Coffee Flask. From snowy trails to secret swimming holes, this hardy-sized 20 oz Coffee Flask will keep you fully caffeinated every step of the way. Made with TempShield™ double wall vacuum insulation, your coffee will stay piping hot for up to 12 hours or cold brews icy for up to 24. Durable 18/8 Pro-Grade Stainless Steel construction. BPA-Free and Phthalate-Free. Compatible with our Wide Mouth Flex Cap, Hydro Flip™ Lid, and Wide Mouth Straw Lid. Comes with Hydro Flip™ Lid. Lifetime Warranty with manufacturer. Height: 9.1". 20oz. Imported.