What Our Gearhead(R) Experts Are Saying:"The Lost Ranger 3N1 is my go-to for unpredictable conditions. The three configurations make it adaptable for anything from warm nights to frosty mornings, and it's not even as heavy as carrying two sleeping bags-perfect for backpacking trips where versatility is key."The Lost Ranger 3N1 Sleeping Bag is a versatile sleep system that adapts to our adventures. Designed by Big Agnes for maximum comfort and temperature range, it combines a Sidewinder-style inner bag and a roomy outer bag for three configurations in one. Use the outer bag for warm-weather outings, the inner bag when temperatures dip, or layer both for cozy warmth down to 15degF. Filled with 650 DownTek insulation, this modular system keeps us warm and dry, even in damp conditions, thanks to earth-friendly water-repellent technology.