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.

  • Features

    • 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 Men's 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



  • Reviews
    9 reviews with an average rating of 4.3 out of 5 stars

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