Each shelf is meant to accommodate 20 pounds of books that are up to 10 inches wide.
"I love my floating bookshelves because they save a lot of space and since I colorized them, they look like fun decor in my room. It definitely helps me get excited about reading more since they're so cute and visible. The shelves were also super easy to hang and, as you can see, they're very sturdy." —Kayla Boyd
Check out BuzzFeed's full review of the Umbra Floating Bookshelf (#6 on the list).
Get them from Amazon for $14.99+. Available in two sizes, and in singles or a set.