Make & Model - Therm-a-Rest Altair Winter Down Sleeping Bag
Listed Temperature Rating - 10 degrees F / -12 degrees C
EN Lower Limit Rating - 10 degrees F / -12 degrees C
Materials - Insulation: 750-fill-power Nikwax Hydrophobic Down; Shell: 20-denier polyester; Liner: 20-denier polyester
Dimensions (unfolded) - Regular: 72 by 62 inches; Long: 78 by 64 inches
Dimensions (packed) - 8 by 18 inches
Weight - Regular: 2 pounds, 7 ounces; Long: 2 pounds, 10 ounces
MSRP - $590 (regular), $640 (long)

The Altair has plenty of room to turn over in, even when zipped up. Insulation is also abundant and concentrated in the right areas. If you want a warm, compact bag to haul on a long journey (the majority of which is spent on foot or skis) this certainly seems to have lab test results galore to substantiate its performance. However, if you're just going for a weekend camping trip and your SUV is nearby, there's probably no need to invest in a bag this costly.

Pros: Outstanding warmth-to-weight ratio, Straps to stay connected to pad or mattress (not included) are nice touches, Comfortable on its own, even without a sleeping pad

Cons: Price is halfway to an actual bed mattress, Outer pocket could be bigger

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