Picked these up at Michaels. Made by CraftSmart, each one holds 48 two ounce pant bottles and 4 larger bottles
Here's a shot of he over the door paint rack. This is two of them, side by side. I tried to include the hooks in the picture, so you can see how it attaches. As I go through the bottles, I am shaking them up and turning them upside down, so that I can readily see the colors.
With the 50% off coupon, it cost mt twenty bucks to store over 100 bottles of paint, in a dead space area.
An excellent idea!