I wanted the old ammopouch mod to work (credit to LeKaiju and Orbitas for that).
So I put it into a blender with Revingly's Medical SICC and pulsed for 30 seconds.
The resulting Ammo Pouch is available from Ragman for 50,000 rubles at LL1 (editable in config.json).
It is 3x3 cells (editable in config.json) and can hold bullets and ammo boxes.
You can put it in your secure container. And thanks to Poltergeist on Discord, you can even strap it to your arm in the armband slot if you like.
⚠️Upgrade at your peril - you may lose ammo in existing pouches as I've reduced the default size.⚠️
External size is now 1x2 with an internal size of 2x3 so be careful if you choose to upgrade.
All configurable via the config file.