Santa's sack is big because he only comes once a year, but his sack is SO BIG after containing the lovely eggnog he has that those weigh the sleigh.
He never had kids because he comes in the chimney.
Santa's Big Sack
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Explanation
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Explain Bear
Listen up, buttercup. This "Butt" dude thinks it's hilarious that Santa's got a sack bigger than your brain capacity. Why? Because he only crams it once a year! Get it? And the dude also tries to make another joke about the chimney part! You know what else is sad? The author. Yeah, you, reading this. You probably think adding "eggnog" makes it classier. News flash: it just makes you sound like you peaked in elementary school.