I still REALLY like these, but iirc the reviews on how much weight and how sturdy they are weren’t that great. They are best suited for light loads, and decorative purposes.
I bought these shelves years ago when they cost way more than $3.99. All of these shelves ended up in the trash - they were not secure, fell without warning, were basically garbage. I wouldn’t pay $3.99 for a two-pack.