I was tired of my thread spilling out all over the floor because the lid would pop open when I picked it up. So I bought these Sulky Universal thread organizer boxes. I LOVE them!! There’s 4 rows on each side, instead of 3 like other organizers. The spools don’t fall out, even if the box is opened. They fit many sizes. I have gutermann, coats and clark, and sulky, as well as a bunch of off brands. The shortest coats and clark spools unfortunately only fit one in each space. I was hoping I could fit two. But most spools (as long as they’re 1 3/4” tall and less) have extra space for adding a bobbin so I can keep the colors together and not have an extra case for my bobbins.
Each rod has a tab you pull back to lift the rod to put on and take off the spool.
It holds 64 spools. It even fits the wide embroidery thread spools.
And they fit perfectly inside my cube storage bookcase, which holds 15” bins.
I highly recommend these and wish I found them years ago!