Midwinter expeditions call for heavy duty insulation, summer nights out only require lightweight warmth, and three season trips or winter yurt missions demand versatile, toasty, and packable sleeping bags that don't cost as much as a new house, like the Big Agnes Moon Hill Women's 26 Degree Synthetic Sleeping Bag. One of the most technical synthetic bags Big Agnes makes, the Moon Hill ditches Big Agnes' integrated pad sleeve in favor of full wrap around synthetic insulation, and uses a mummy shape and Insotect Tubic vertical baffles to increase warmth while decreasing bulk. The Pinneco Core synthetic insulation doesn't compress as well as down, but the high loft fibers stay warm even when they get soggy, and create a sleeping system that breathes and wicks moisture in a way most bags can't. Combined with the high loft Insotect Tubic baffle design, the Moon Hill will keep you sleeping in relative comfort all the way down to 17 degrees, making it a bag that's suitable for mild or indoor winter trips as well as shoulder season backpacking. It even has extra room around the feet to trap more heat, and drawcord hood to seal things up around your face when temps drop like a stone. Toss in the no draft collar and zipper, and this is a bag that's suited to all but seriously cold trips.