This is what I use now.
https://www.cousinsuk.com/product/trays-watch-disassembly-assembly
Once you have got a set you will buy more. They stack so depending on what type of watch you are working on you may use 1, 2 or 3 trays or more. I do feel these are the best for storing disassembled watches, especially if you have several on the go as they stack whilst waiting on parts to arrive.