The Thermos Rock Flask 1L is ideal for the workplace and on outdoor adventures! Thermos Vacuum Insulation technology ensures maximum temperature retention - meaning your liquids stay hot or cold for up to 24 hours! The Thermos Rock Flask features an unbreakable stainless steel interior and exterior with an extra-large ergonomic handle - perfect for any work site! Thermos has engineered this flask to be cool to the touch when used with hot liquids, and free of condensation when used with cold liquids. To use, simply twist the stopper and pour in to the included, insulated stainless steel cup!