Each shelf contains up to 15 pounds, and reviewers recommend bringing their biggest, heaviest books on every shelf to receive more support.
Promising reviews: “It's so much fun! We ordered the small size, the standard hardback books fits (about 5–7 hardbacks in my experience). You are a great way to give our very small home additional storageAnd we put them in our hallway so that people ask us for them all the time. I would highly recommend! ” – Labuenavidamere
“I bought two of them in 2010, and in the past 10 years I used them in three different apartments. I simply set them up in the number three apartment and was again canceled from how great they look. Every time I set them up, it is like 'wow, wow, these are amaaazzinggg !!“If you love to decorate with books, this is a must!” – Jlands
Get it from Amazon for 21.72 USD+ (available in two sizes, two colors and in three sets).