I think mine has to be at least 50 lbs. I hate to make trips to the truck so my bag is just the right mix of tools [for me] to complete 98 percent of my calls.
Maybe we oughta design our own preliminary diagnosis bag. If I has a wish I would want a lightweight circular bag with a ohms meter in the center. Surrounded by essential nut-drivers, Phillips, and flathead's, wire Skinner, and crimper tool.