kennedy boxes for precision tools, old kennedy boxes for everything else. (Kennedy still makes precision/machinist boxes in the USA, but sold out rights to cantilevers and fliptops to homak overseas. still a decent product)
I have one large kennedy machinist box at about 100 Lbs with all precision tools, mics, indicators, etc (all starrett), one cantilever with electrical tools (weller soldering iron, simpson analog and fluke digital meters, crimpers strippers, etc), one flip top with 1/4", 3/8", 1/2" drive sets, allen plugs, wrenches, extentions. one flip top with brass wedges, softeners, punches, transfer punches, chisels, hammers, deadblows, etc.
one for plyers, channellocks, vice grips, screw drivers, pipe wrenches, etc.
depends on what your working on really