Faxx

That's a large ass kitchen sponge then

You are assuming standard size sponges and standard sized bears. We know spongebob is fairly standard size because of the spongebob movie. Therefore we must conclude that the bears are small. The bears are bar probably only weight a few grams. What's actually impressive here is that sponges don't have muscles. Like, not they are weak. They literally do not possess muscles. Spongebob's clothes should be a helluva lot of extra effort to carry with him. The fact that he can lift these teddy bears is very impressive.