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If you check out the relative densities of water, lead and sand (rock) you'll find you probably need about 5 times as much sand (by volume) to get a similar effect as lead.
I have imagined that it would require some pouches about 10"-12" deep and something inside to help them hold their shape. Being able to dump it easily might be a complication. But it would be nice to not have to carry the extra weight of a lead belt while going beach diving, especially if it's somewhat of a hike.
There should be an honour system where you can leave your weights at the bottom of the cliff. Yeah sure. Sand weight belt system usage was superseded for filling holes in masks and spg's