I would suggest a
Sortainer Sort/3 with foam inserts.
I think the Sortainers are perfect for everything, which is low height (less than 66 mm). One Sortainer is cheaper than three Sys3 M 112, and you can easily get access to the drawers, also when the sortainer is at the bottom of a stack.
In the photo below I have used 50mm thick inserts from Shadow Foam UK. I bought a box of 3 plates 50x400x600 mm, enough for 6 drawer inserts.
I first use a bread knife to cut them to fit the drawers. Then I cut with a scalpel around the outline of each tool. The foam is layered, so I can peel off one or more layers to get the depth I want.
I also have a box of 5 plates 30x400x600 mm, enough for 10 drawer inserts. 30 mm is thin enough to fit two in a drawer and still have 6 mm left for a protection sheet for transport. I plan to use those for my measurement tools, putting the most rarely used at the bottom.
My total cost for 16 inserts, cutting tools, cut protection gloves, extra scalpel blades and transport was around 110 Euro. So one insert is around 7 Euro + my own labor.
This foam is polyethylene with rather large cells. Don't expect it to feel like a luxury item. It feels like someone turned plastic water bottles into foam (which could very well be true). But it is still much nicer than the foam you see in some tool cases where you pluck out precut cubes to fit your tools.
If you want something better, you could look into EVA foam. But I think you need to route the pockets in that, so it will be a more elaborate job.
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