A katamari can only pick up items that are its size. Weight, size and surface area all are taken into consideration to determine whether or not something will stick to the ball. This means slender objects that are taller than the katamari, but weigh less and occupy less space, can be picked up. Just remember, a katamari the size of your foot is a katamari that can be destroyed; a katamari the size of a large American is a katamari that can not be stopped.

At 2 meters, a katamari will pick up most people, with very few exceptions. At 5 meters, a katamari can pick up cars. At 10 meters, a katamari can pick up trees and small houses. As it reaches 10 meters, the growth of a katamari can be quick.