The Big Agnes Torchlight collection consists of unique, expandable sleeping bags, and the Torchlight 30 Sleeping Bag is the best option for 3-season camping and the occasional backpacking trip. Dual zippers allow you to expand the bag by about five inches to accommodate different clothes for different conditions. Slide the zippers down for extra room when you're wearing insulators, or if you simply want more room, and slide them back up to keep you snug in summer clothing. Big Agnes treated the bag's down insulation with DownTek to retain its lofty warmth in wetter climates, and the shell is water-resistant for extra weather protection.