What size cooler should I get for a family of four on a three-day camping trip?

Get a 70-quart cooler. It’s the sweet spot—holds enough food and drinks for three days without needing to restock ice daily. A 50-quart feels tight once you pack drinks, meat, dairy, and leftovers, while a 100-quart is heavy and unnecessary unless you’re feeding an army. Make sure it’s rotomolded (like Yeti or RTIC) so ice lasts three days.