Lifeventure Vacuum flasks are lightweight & tough stainless steel flasks. The high quality construction is finished off with a graphite coating. We have sold these for several years & in our opinion find them to be both reliable & efficient. The vacuum is created by heating & cooling the flask (Ti V = thermally induced vacuum) which is a much more reliable method than many other flask designs. Both one-touch & screw-in stoppers are supplied & this flask will Keep drinks hot for up to 8 hours & cool for 24 hours. The Ti V stainless steel lid can be used as a cup. Featuring a sleek design for easy storage & exceeds requirements of British Safety Standards. Capacity: 1.0 L Dimensions: 83 x 83 x 320 mm Weight: 570g