On the Japanese crowdfunding site ‘Makuake’, the porcelain bottle ‘KOKORO’, which has been sold in advance, has sold over 4.6 million yen. Stainless steel is the standard choice for portable bottles, but this unique bottle is made of porcelain, which is easily broken. Using porcelain has the advantages of reducing metallic odors, preventing coffee and tea stains, and preventing metallic components from dissolving out of the bottle. On the other hand, KOKORO reduces the disadvantages of porcelain’s susceptibility to breakage by separating the porcelain part and making it replaceable.