Best filling for a punching bag (Sawdust vs Rags vs Sand)

Clothing - lots of clothing. Sand is not good - way too dense. You can add a small amount of sand - maybe 10lbs wrapped in a bag towards the bottom of the bag to add weight.
 
I wonder what a heavy bag filled with ballistics gel would be like??
 
There would be little to no benefit of having a bag filled with ballistics gel, at least none different than you'd get from one of those water ball things.
 
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