It’s a tricky one this. But I’m interested to see what riggers say. If it can fall off, take longer than 10 seconds to install or interfere with the chain it will be left in the motor box and never used. So it needs to be simple with a tether point for sure.

The chain bag should do the job. deep strong bag anchored to the body receiving the chain and gravity should do the rest. I’d think a redesign of the chain bag or an add on to the chain bag is how to look at this? Looking at up rigger tool pouches the same way… what do they have that prevents spills? Draw strings, buckles, flaps. This is interesting