Ito En "Oi Ocha" This is a novelty item to commemorate the 30th anniversary of its release, the "Ideal Warm Bottle Cover". It is new and unused, except that it was opened for photography. Product Details This bottle cover has the effect of keeping warm PET bottles warm for a long time, and according to Ito En's research, it is said to have a heat retention effect of up to +5°C. Design: Features the popular character "Ocha Inu" (Tea Dog).