I assume dive weights are relatively small volume?
If so, do you actually pad the bottom of the bag that you use? This would help distribute the weight across the entire bottom, instead of all these little weights tumbling together and funneling at the bottom of the bag.
Have you looked into the pricier bags? Things like Kifaru or similar tactical gear - no affiliation, it's just a bag I have in front of my right now. Lots of tactical bags tend to be double or triple stitched, with very good warranties, plus come in numerous volumes.
Or you could just buy a dolly.
