Big Agnes - Lost Dog 0˚ Bag

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Big Agnes - Lost Dog 0˚ Bag

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Stock #: HT9E-

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Big Agnes System bags with FireLine™ ECO synthetic insulation offer a roomy, rectangle-shaped sleeping space with an integrated Flex Pad Sleeve on the bottom. With technical fabrics and construction, 100% recycled, super-warm insulation, and tons of comfort features, these comfortable sleeping bags are designed to be lightweight enough for backpacking but cozy enough you'll want them in the campground too. The streamlined silhouette and Flow™ construction increase the thermal efficiency keeping you warm from head to toe. The Flex Pad Sleeve unites easily with your pad, and as you change positions over the course of the night, will keep you from rolling off your pad.


  • The Big Agnes System bags offer technical, roomy sleeping spaces for those who aren't willing to sacrifice comfort or packability
  • Streamlined silhouette for increased thermal efficiency
  • Flex Pad Sleeve features stretch construction that accommodates multiple pad widths, and easily connects your bag to your pad
  • Regular and Long bags fit 20" - 25" wide pads, Wide Long bags fit 25" - 30" wide pads
  • Free Range Hood gives you the freedom to lift your head. Jacket-style hood opening contours to the shape of your face for a comfortable, snug fit
  • Low-profile cordlock lets you un-cinch the hood with one hand
  • Pillow Barn – keeps your pillow tucked in tight all night
  • Internal hood drawcord gives you a secure, cozy fit when cinched
  • Free Range Footbox - creates wiggle room for your feet
  • Rectangular shaped bag
  • Anti-snag zipper for a smooth, quick zip
  • Regular: 65" / 165cm YKK #5 anti-snag locking zipper
  • Long: 70" / 178cm YKK #5 anti-snag locking zipper
  • Wide Long: 70" / 178cm YKK #5 anti-snag locking zipper
  • Zipper Garage
  • Mate together left and right zip bags
  • No-draft collar, no-draft wedge, no-draft zipper
  • Interior fabric loops for sleeping bag liners
  • Exterior loops for hang drying or storage
  • Mesh storage sack & polyester ripstop stuff sack
  • Construction + Materials
  • Nylon ripstop shell fabric with a water repellent finish
  • Soft, cozy polyester lining
  • FireLine™ ECO Synthetic Insulation - 100% post-consumer recycled polyester. Features low-denier fibers that are tightly woven and provide high loft, compressibility, high weight-to-warmth ratio and durability


  Regular Long 
Bag Weight 4lbs 2oz 4lb 10oz
Fill Weight 46oz / 1.30kg 52oz / 1.47kg
Compressed Bag Size 9" x 11.5" / 23 x 29cm 9" x 12.5" / 23 x32cm
Stuff Sack Size 10" x 21" / 25 x 53cm 10" x 21" / 25 x 53cm
Bag Size fits up to 5' 10" fits up to 6' 6"

Additional Information

Material Nylon ripstop shell fabric with a water repellent finish
Insulation FireLine™ ECO Synthetic Insulation
Temp Rating
Shoulder Girth Regular 69" / Long 72"
Hip Girth Regular 60" / Long 63"
Foot Girth Regular 49" / Long 52"
Packed Size Regular: 9" x 11.5" / 23 x 29cm / Long: 9" x 12.5" / 23 x 32cm
Weight Regular: 4lb 2 oz / 1.87kg / Long: 4lb 10oz / 2.10kg
Zipper Type YKK #5 anti-snag locking zipper
Stuff Sack Regular: XL 10" x 21" / XL 25 x 53cm / Long: XL 10" x 21" / XL 25 x 53cm

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Product Videos

  • Synthetic System Bags with Flex Pad Sleeve - Lost Dog Series


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