Good question. No idea, SevenStar.
I suppose that depends on what you would fill it with - regular sand versus something like metal filings or fine ball bearings like in an iron palm bag - that would change the overall weight significantly, I imagine. To be honest, I've never tried to fill one. But given they way they are constructed, it would be easy enough.
Find out more in our FALL 2019 issue
Getting Shredded with Traditional Weapons
Kung Fu, Weightlifting and the Heavy Guandao
By Gene Ching
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FALL 2019