One of the biggest complaints would-be campers have is sleeping on the hard ground. A Therm-a-Restself-inflating sleeping pad can cure that.
The NeoAir Venture offers two inches of baffled padding to cushion and insulate you from the cold ground. It packs in the included stuff sack that is about 11" long. Constructed of durable 75D polyester it will last for many years.