What size tent do I need for family car camping?

A common rule of thumb among campers is to size up one or two people beyond your actual group to leave room for gear, air mattresses, and movement. A '6-person' tent comfortably sleeps about four adults with luggage, and an '8-person' tent suits a family of four-to-five who want cots or a queen mattress plus storage. Several picks here are sold in multiple sizes under the same listing.