7cm wide opening with stainless steel vacuum flask. Suitable for ice and easy to cleanAg+ anti-bacterial processed handleExcellent keep-warm and keep-cool performanceSafety valve prevents water leakage in case of accidentNo-stopper design convenient to useDetachable lid for easy cleaningA vacuum bottle also known as a thermos bottle or vacuum flask is a type of insulated bottle or flask that uses vacuum between its walls to keep hot liquids hot and cold liquids cold. These premium vacuum insulated water bottles which are also thermal water bottles exemplifies ease affluence and style using its advanced technologies.