The ONLY unit larger than a kilogram that is commonly used is the tonne (pronounced 'metric ton'), which is equal to 1000 kilograms. For larger masses, you would only say "millions of kilograms", "thousands of tonnes", "billions of tonnes", etc.
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A barrel is not a uniform unit of measurement. Therefore, the two units are incompatible.
A kilogram is a unit of mass. A yard is a unit of distance. The two units are therefore incompatible.
A litre is a unit of capacity. A kilogram is a unit of mass. The two units are therefore incompatible.
Neither of those units will produce a very convenient number. But of the two, the kilogram is the better choice.