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Don't know that it's Festool proprietary, I've an old Makita saw case that connects with an old Festool case, they're identical (apart from the color, of course)
veLLo-
Systainers are made by TANOS and lots of brands use them, the only difference really is the colour scheme. You can buy pre-cut foam inserts in shadowfoam or pick n pluck etc...
All my tools are in them... decent sized form factor to just be manageable on the front of a bike if I need to transport. The stacking functionality makes storage of multiples easy.
You wanna try and get the modern T-loc ones rather than the four-clip style more commonly used by Makita with the name "mak-pac". the former fits together much quicker and easier.
If you have a mix of the old style and the new, the new ones have to go on top of a stack... might not mater to most but can be frustrating if you have a system of any kind.
The cheapest ones I've ever bought are black with the grey clip and say "Panasonic" on the side.
If you want a wheely base for them, the metabo/hitachi one is the cheapest I've found.
general_greyharbour
Off to see if AliExpress has any festool copies yet...