I give this bed a one star because the number of slats and the quality of the slats was insufficient to support ANYTHING. 4 horizontal slats, made of knotty boards, per bunk is laughable. One slat split even before it was fully installed.
My kiddo loves the look of the bed so rather than return it I then purchased a well made bunkie board. That did not work either because the distance between the vertical rails to hold the boards is not the standard twin (or twin XL) measurement.
We are going to the lumber store today to have custom slats cut.
Once it’s together the bed will work fine, but it is a pain in the patooshkie to get there!