Local feral survivors in eight frame medium boxes.
I just grab the back handle of the bottom box and lift it to estimate the weight. I know what a 50 lb box of nails feels like or a 50 or 100 lb bag of feed so it's not too hard for me. Some of it is practice too. Heft it and then look inside and see how full it looks. Going into winter with deeps around here you want at least a full box of deep frames of honey on top and the bottom box should have about 5 frames full of honey and pollen. Three deeps isn't bad either. Of course now I'm looking for three to four mediums mostly full.