Since a Baseball cap weighs less than one kilogram, using grams would better. For example 120 grams, as opposed to 0.12 kilograms.
Kilogram
Kilograms!
Kilograms
Grams
You measure your carrot in grams,but for a pack of carrots it would be kilograms.
kilograms
Kilogram
Kilograms!
Kilograms
you can't use kilograms to measure a orange, but you can use grams.
grams
Grams
You would measure a boy's weight in kilograms. Grams are more suited for measuring small, lightweight items.
grams
Grams
You would typically measure an encyclopedia in grams, as kilograms are typically used to measure heavier weights. A typical encyclopedia would not weigh enough to be measured in kilograms.
I would describe their weight in grams.