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A porcelain yutanpo (hot-water bag). By utilizing porcelain as the material, the uneven surface to resist decompression, which often appeared on past yutanpos, can be removed, while Ceramic Japan's yutanpÖ is also in a soft form that is comfortable to embrace. Users could warm the yutanpÖ by opening the aluminum cap, pouring tap water into the yutanpÖ, and putting in the microwave.

Received the design award with a 60-year history, "Red Dot Award: Product Design 2015," sponsored by Germany's "Design Zentrum Nordrhein Westfalen."
https://www.shokunin.com/en/ceramicjapan/yutanpo.html