After staring this thread about farmers walks I decided to make a pair of top loaders and add them to my training . They are about 25kg each.
They are quite solid and I have welded all the end caps for the handles and posts and polished them back before being painted. I made it out of 75x50x3mm, handle is 30mm diameter x 4mm thick .
I put 6mm thick ski's on either end so if you drop the load your toes won't get squashed. It gives you a more stable footprint as well.