I’m posting a photo I took during a seminar and tour of a paper conservator near Austin. They had dozens of rolls of various media - paper, canvas, plastic etc on these shelf brackets that worked with standards.
If anyone knows where to find them - please let me know.
I some for book shelved in a bedrooms and they had the right size screws used
I put some up in my storage building and I tried to cheat with too short
of screws, They pulled out after 9-10 yrs with heavy things on
them, like boxes of stone and glass beads!