Copper hot water bottle, designed for excellent heat retention. Shinkodo Metal My father-in-law bought this from a catalog and used it once or twice before storing it at home. This is a pure copper hot water bottle from Shinkodo (capacity 2.3L). The material is pure copper. The capacity is 2.3 liters. The surface finish is Scotch-Brite finish (matte). It features excellent thermal conductivity and heat retention, keeping you warm all night long. Accessories: Organic cotton case Outer box Spare packing Instruction manual (with a few holes) Retail price: 19,800 yen