The below is a collection of Tibetan book-holders. I took the photos where they were hung and stacked in the entry-way of the main prayer hall of rGan Gya dGon Pa, on the plateau north of Labrang, while bumping around on a fortressologizing trip with my dad this summer. Afterwards I spent a long time looking to buy one in various places. They are hard to find now, and good ones have to be commissioned specially from craftsmen. The best ones here have been individually hand painted on each panel, and the wooden frame enameled with silver. Other than rGan Gya, where it seemed that every monk had one, I have not seen them in common use elsewhere.
These things are called by are different names in different places. In Labrang they are called Shog Bu Ba Li, in Rebgong they are called Lag Shing, and in Lhasa-dialect they are Shing Leb. Tibetan books (dPe Cha) are long, flat, and loose-leafed. The idea is that you bind the book with cloth, press them between these two boards, and bind the whole thing tight with a cord. I think they are an eminently lovely way to carry your books around.