Nice article.

I have only one chopstick sleeve in my collection, a humorous, slightly risqué one from a ramen and gyoza shop in Yokohama that I frequent. Here is a photograph with transcription and translation:

https://gally.net/temp/20250120sanyochopsticksleeve/index.ht...

Another kind of commercial ephemera that people collect in Japan are the paper covers that bookstores provide for customers. Each bookstore typically has its own design. Here is one collector’s blog:

https://bookcoverfan.livedoor.blog/

Some bookstores also provide their own bookmarks. Here is a collection of those:

https://hyohyosya.hatenablog.com/entry/2015/09/13/%E3%81%97%...