You should check Tokyu Hands in Shinjuku or Shibuya, they might have what you need.
Japanese friend, I need to buy a big lightweight bag, plastic or linen etc to contain this go board. Any idea where I can buy such thing?
#japan #nostrasia
nostr:npub1xv8mzscll8vvy5rsdw7dcqtd2j268a6yupr6gzqh86f2ulhy9kkqmclk3x for scale 
You should check Tokyu Hands in Shinjuku or Shibuya, they might have what you need.