What weighs more 1 kilogram of feathers or 1 kilogram of bricks?

1 kg of feathers vs. 1 kg of bricks

Kilograms are a measure of mass, not weight (weight is a type of force, which is measured in newtons or pounds-force). It depends entirely on where you measure them, but if measured in the exact same place, they would weigh exactly the same too.

Other answers have been moved to the discussion area - where they should be since they only discuss - as they do not answer the question in any meaningful way.