Very similar to what RJM uses, I made a chest carry rig out of a windblocker-type fleece camo beanie. It conforms to your body because it is stretchy and it is super light.

I really like that the hardware can be totally protected under a coat and you can drive and sleep with it on.

Chest rigs are incredibly simple things when reduced to their bare essentials. They are trivial to DIY. I would not use anything else, ever again.

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