This is a portable water bottle that can vacuum store hydrogen water for one week. 
Even if you dispense it every day, it will maintain 90-100% of the concentration of dissolved hydrogen in the liquid (when the remaining amount is 10% when full) for one week, so it is recommended for those who want to feel the full effect of hydrogen. 
Even if you store it for 10 days without dispensing it, it will still maintain a high amount of dissolved hydrogen, so it is also suitable for taking it home from the sports club.