Big Agnes Lost Dog 15 Sleeping Bag

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The Big Agnes Lost Dog 15 sleeping bag is filled with warm, 100% recycled insulation, and has a sleeve that attaches to your pad like a fitted bedsheet to keep you centered on your pad all night long.


  • Flex Pad Sleeve stretches to unite with your insulated sleeping pad (sold separately) and, as you change positions throughout the night, keeps you from rolling off your pad
  • Streamlined, rectangular shape and comforter-style lining give you plenty of wiggle room without sacrificing the thermal efficiency of a traditional mummy bag
  • FireLine™ ECO synthetic insulation made with 100% post-consumer recycled polyester provides high loft, compressibility, a high weight-to-warmth ratio and durability
  • Designed to be used with an insulated sleeping pad; rectangular shape recommended
  • Regular bag fits pads 20-25 in. wide x 72 in. long
  • Long bag fits pads 20-25 in. wide and 78 in. long
  • Can be zipped together with a right-zip bag (not included) to create a double bag
  • Insulation features low-denier fibers that are tightly woven and provide high loft, compressibility, high weight-to-warmth ratio and durability
  • No-draft collar, wedge and zipper help seal out cold air
  • 2-way YKK® #5 antisnag locking zipper with zipper garage offers a smooth, quick zip
  • Internal hood drawcord gives you a secure, cozy fit when cinched; low-profile cordlock lets you uncinch the hood with one hand
  • 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
  • Free Range footbox creates wiggle room for your feet
  • Pillow Barn keeps your pillow tucked in tight all night
  • Liner loops let you attach a sleeping bag liner and help keep it in place (not included); exterior loops are great for hang drying or storage
  • Includes mesh storage sack and nylon stuff sack


View all Big Agnes Backpacking Sleeping Bags

Technical Specs

Best Use


Temperature Rating (F)

15 degrees (F)

Temperature Rating (C)

-9 degrees (C)


Ripstop nylon

Zipper Location


Insulation Type



FireLine ECO synthetic fibers



Sleeping Bag Shape


Stuff Sack Size

9 x 20 inches

Stuff Sack Volume

20.9 liters



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