We Reveal The Best Sleeping Bags For Cold Weather Outdoor Camping. There are couple of feelings as tasty as cuddling into a warm sleeping bag at the end of a wonderful day on the path, and there are couple of feelings as disturbing as moving into your sleeping bag and recognizing that it's not warm enough and you remain in for a sleepless, shivering night. A perennial favorite of ground sleepers and hammock swingers, the Feathered Pals Flicker UL 20 is the most versatile sleeping bag on our list. A perfectly created full down collar helps to seal in heat around your neck without including extra bulk. The 16 ounce of 850 fill makes it possible for high compressibility, resulting in warm and lightweight spacing. Western Mountaineering UltraLite 20 is thought about as the warmest bedroll among the other 20 degree Fahrenheit bags.