Folding wooden bookshelves

Some people like folding bookshelves because they take up little space in a car or truck on moving day. Unless you move frequently, this should probably not be a factor in your choice of shelving. Some people use them as displays at trade shows. In this case, the fact that they are collapsible is a real plus. Folding bookshelves may be harder and longer to assemble, so you should read reviews and weigh out the pros and cons before you make a decision on which unit to buy.
Folding wooden bookshelves:

Folding wooden bookshelves pictured: Stackable/Folding 3-Tier Shelf, Black, by Winsome Wood