Big Agnes Lost Dog Sleeping Bag
Best spacious synthetic option for side sleepers and car campers.
A reliable three-season option for backpackers who prioritize warmth in damp conditions. The synthetic insulation excels in wet weather, while the integrated pad system keeps you securely on your sleeping surface all night long.
$168.95
More Lost Dog options
Who it's for
- Active sleepers who frequently slide off their sleeping pads at night.
- Side sleepers and campers who feel restricted by narrow mummy bags.
- Environmentally conscious backpackers seeking reliable performance in humid or wet conditions.
Who should skip it
- Ultralight backpackers prioritizing minimal weight and maximum pack space.
- Cold sleepers using low-rated pads in near-freezing temperatures.
- Campers who prefer using extra-wide or non-standard sleeping pads.
Performance breakdown
Wet-weather performance
Synthetic insulation maintains critical loft and warmth even when damp.
Sleep system integration
Integrated pad sleeve eliminates the frustration of sliding off your mat.
Thermal efficiency
Reliable 15-degree rating handles shoulder-season chills with consistent heat retention.
Durability
Ripstop shell withstands rugged backcountry use without sacrificing weight or packability.
Comfort and roominess
Generous cut offers plenty of space for side sleepers to move.
Moisture management
Water-repellent finish effectively beads off condensation and light morning dew.
Key Specs
Temperature Rating
15 degrees Fahrenheit
Insulation Type
FireLine ECO synthetic
Shell Material
Nylon ripstop
Lining Material
Polyester
Season Rating
3-season
Water Resistant
Yes
Zipper Location
Left
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