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The Big Agnes Lost Dog 50 is a synthetic fill sleeping bag that compresses into a tiny package. It is a top bag with insulation only above the sleeper, relying on a sleeping pad to provide insulation underneath. It is the lightest in the Big Agnes range of top bags at 21.2 ounces. The Lost Dog 50 has 0.4 inches of loft and is rated to 50 degrees F. Not a lot of loft for the weight, but it does have some advantages over ultralight sleeping bags.


  • Introduction
  • What's Good
  • What's Not So Good
  • Specifications: Manufacturer, Year/Model, Style, Fill, Loft, Manufacturer Claimed Rating, Weight, Sizes, Fabrics, Features, MSRP
  • Performance
  • What's Unique
  • Recommendations for Improvement

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