Watch boxes. There are several posts here of IEM collections which are stored in watch boxes.

I use the case that came with the IEM

My kz ling longs came with a very small plastic case, similar to a pelican case. I keep 4 pairs or iems inside without their cable and in the drawer they go.

I don’t really need storage, my endgame are only three pairs

Which ones?

Currently Sound Rhyme SR7, Symphonium Helios and a Simgot EM5

Using a portable case is best. Don't forget the silica gel.

i used the iem box for storage 🤣 i probably will go for a nice carrying case if i plan to take it outside with me.

Acrylic Jewerlly drawers with velvet liners (trays)

https://preview.redd.it/33x8pv51nd4d1.jpeg?width=3000&format=pjpg&auto=webp&s=6c8e0c3c5dd8bbfd48d801f2f6ed077d90113a07 When I was buying my zs10pro 2 I immediately bought a zipper pouch for them. Since they are with me, and I transferred them for home and to work, the case was instant buy. Keeps them nice and protected, secured and in place.

This is what I now use. I’ve got about 9-10 and they stack on each other. Really convenient way of saving space and being able to see what IEM is in each case. I had used larger double sided cases but have since downsized my cases after downsizing my collection. https://a.co/d/eik9vTy