Each shelf can hold up to 15 pounds, and reviewers recommend placing your largest and heaviest books at the bottom of each shelf for better support.
Promising review: “This is so much fun! We ordered the small size which fits a standard number of hardcover books (about 5-7 hardcovers in my experience). It's a great way to add storage space in our very small home. We keep it in our hallway and people ask about it all the time. Highly recommend!” —LaBuenaVidaMere
“I bought two of these in 2010 and have used them in three different apartments over the past decade. I just installed one in my third and am blown away by how great they are. Every time I put one up I'm like, 'Wow, wow, wow, this is amazing!!' If you love decorating with books, this is a must buy!”—Jlands
Get it on Amazon for $12.97+ (available in two sizes, two colors, and a set of three).