Milton Elfin Thermosteel Flask Flask, 160ml (EC-TMS-FIS-0051_Steel),Stainless steel Key Features:  160 ml Capacity  Keeps drinks hot or cold for 24 hours Simple threaded lid for easy use  100% rust free steel Copper coating for better heat retention Milton insulated steel bottles are a part of the thermosteel range. Its unique temperature retention mechanism keeps your beverages hot or cold for 24 hours. This bottle is extremely slim and compact and would fit easily into the side pockets of your bags.