This is what I was using in the last 30 years, too: sealed letter envelopes cut in half.
So far, it was the best way to store various TH components in small quantities.
Very easy and fast access to parts, small space footprint, very cheap and very easy to make, zero maintenance.
Actually, none of the expensive organizers I have can beat the DIY ones.
These ones, also the most expensive ones, are the worst: drawers are hard to open, the material is not fully transparent and you need to open 100 drawers to search for parts, dust can easily enter into closed drawers, the parts jumps out of drawers if transported by car, and so on. A total fail, but an expensive one: what's in the picture costs a couple of hundred USD. Half of them are still in their original sealed plastic foil. The other half is sparsely populated with very rare accessed parts, rare like once in a year or less.
On the orange cap is embossed "TOOD". Stay away from them.
Some of my other DIY organizers:
https://hackaday.io/project/6261-new-a-free-lab-organizer