Tired of hauling your stones to go club in your grandmother’s ancient Tupperware? Here is a bento box that appears to be sturdy, robust, about the right size, and relatively inexpensive at around US$30.

https://us.monbento.com/en/shop/lunch-box/square-bento-box-mb-square-pine-green-grey.html

The two separate compartments might even be a bit large for 6-9mm stones at 7cm deep, 14cm square. That’s about 2-3/4” deep, 5-1/2” square. So not quite deep enough to safely hold real wooden go bowls.

I saw this bento reviewed on America’s Test Kitchens. If you put your stones In one of the two units, you could bring dinner, too.

https://youtu.be/R8YrhOW6BvI

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David Bogie, Boise ID
I play go, I ride a recumbent, of course I use Macintosh.