this thing is called bai-bao-jia.The Chinese used it to store flat items about a hundred years ago.
I tried looking up “bai-bao-jia”, and also the words “zhen xian bao” which I later found associated with it, but I only got pictures of bao buns. So after searching for various iterations of “Chinese paper pocket storage” and so on, what you want to google in English is “Chinese thread book” to find lots of pictures, variations and tutorials.
Edit: to clarify, the reason I couldn’t find it with those search terms is cos the Google algorithm is shit now. As I understand it, those are the real (transliterated) names.





















