By Hirotaka on July 14, 2010 4:13 PM
From this yaer, we can post POCARI SWEAT (one of the most famous isotonic drink in Japan).
We can buy a packet of dried isotonic drink at post office, write a message on the package of it and post it.
I think it's happy to receive a letter along with isotonic drink especially in hot summer.
It is on sale until the end of August.
