Sleeping bags: Your sleeping bag is going to be a valuable piece of outdoor camping gear. You will need to choose between different types of insulators in sleeping bags, as well as sleeping bag designs. A down-filled sleeping bag will be a little more expensive but will last two to three times longer than synthetic-filled sleeping bags. Down sleeping bags are very soft and have a great warmth-to-weight ratio. Synthetic-filled sleeping bags are very convenient because they are machine washable and dryable. Synthetic sleeping bags are easily warm enough for summer camping. Certain sleeping-bag features will also add to the warmth and comfort of your camping experience. Hoods add tremendous warmth around your head, and draft collars prevent heat loss around the neck.