I use plastic bead filler that is used for making 'weighted blankets' for vet use. Its nicely weighted (not has heavy as sand), hydrophobic, large enough size that it wont leak out, and is nicely positionable and doesn't cost the earth. If you have ever been frustrated with sand in your bags, try this stuff.
https://www.sensorycorner.co.nz/coll...ic-pellets-3kg
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