Kilogram is a measure of mass but in common parlance "weight" is used to mean "mass" therefore one would normally use the kilogram.
The difference between weight and mass is only important when you need to be scientifically rigorous. Then you would use Newtons which is the scientifically correct unit of weight.
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I would use the metric unit is inches
You best bet would probably be to use kilograms.
Milliliters is the metric unit to use for the capacity of a thimble.
The customary unit would be miles (mi), and the metric unit would be kilometers (km).