What size cooler is best for a family of four on a weekend trip?

A 70-quart cooler is the sweet spot. It handles a family of four for a weekend without overcomplicating things, fitting enough food, drinks, and ice for three days without needing a second cooler or a minivan. Smaller coolers force tight packing, and larger ones are too heavy and awkward. For car camping, weight is less of an issue, but if you’re hauling it any distance, you’ll appreciate not overbuying.