湯たんぽ 暖水袋
A container filled with hot water and sealed with a stopper that is used to provide warmth.  Modern hot water bottles used in the west are commonly made of rubber (ex: post #1830554).  Japanese-style hot water bottles are oval-shaped with ridges (ex: post #5125685).

h4. See also

* [[Ice pack]]

h4. External links

* "Wikipedia article":https://en.wikipedia.org/wiki/Hot_water_bottle
hot water bottle