Zojirushi Handle Thermos Isamu 500ml No box Unused Zojirushi Handle Thermos Isamu Portable Vacuum Bottle KNK-500 Red 0.48 liters (full capacity) Inner diameter of inner bottle opening 31mm Unused, so the condition is very good. It's probably from the Showa era and is a discontinued item, so it's rare, and the retro design is very cute.