The usable space in the 21 inch version is only about 2 inches deep. There really isn't much depth left between the piece attached to the wall and the edge at the edge. A small condiment bottle might fit, but a Pam (cooking spray) bottle will not. I ended up installing it upside down as I've read some people have done. So far, so good. The inverted Pam bottle fits with little headroom. I wish they had more shelf sizes. I love team items - they're easy to hang, they don't get damaged, they're really great. Note that with an inverted installation, you slide down to remove the shelf (to put pressure on the adhesive) and also place it back on the underside. So make sure nothing is directly underneath where you place it. (e.g. in the picture I made sure I got a few inches above the outlet) Overall it works, great quality as with all team products but definitely lacks useful shelf space.
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