The Sierra Designs Backcountry Zipperless Sleeping Bag is the most versatile and intuitive sleeping bag design on the market. With this camping zipperless sleeping bag sleep in the wild like you do at home, with a comforter. With an oversized, integrated comforter sealing the opening, you can sleep comfortably and naturally on your back, side, or stomach. The Sierra Designs Backcountry Zipperless Sleeping Bag is free of extraneous hardware such as zippers or Velcro, the versatile oversized comforter is free to be tucked into or pulled out of the bag opening – adapting to any of the sleeping positions you prefer-back, stomach or side. Adjusting to variable temperatures throughout the night is equally intuitive. Tuck the sides of the comforter snuggly around and beneath you when the temperature drops, or pull out and tuck back the comforter during warmer nights. It’s the ultimate in flexibility and comfort.