Big Agnes Flume UL 30 Sleeping Bag

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BIg Agnes Flume UL 30 bag is made for adventures where every ounce counts, each nook and cranny in your pack is accounted for, and you depend on performance like you would a harness, helmet or beacon.

  • Features

    • Traditional mummy shape allows for light weight and increased thermal value
    • Body-mapped baffles optimize thermal efficiency
    • Oversize, interior anti-draft collar; antisnag draft tube prevents heat loss along the zipper
    • Insotect Flow™ construction uses vertical thermal channels to distribute heat more readily from end to end (compared to traditional horizontal baffles)
    • Contoured hood baffles cradle the head for a comfortable fit
    • Ergonomic foot-box construction provides loft and warmth
    • Ultralight, high-tenacity shell fabric
    • DownTek™ water-repellent down sheds moisture while maintaining insulating value
    • Low-profile cordlock lets you un-cinch the hood with one hand
    • Minimal zipper cuts weight and reduces cold spots
    • Interior fabric loops for sleeping bag liner (liner not included)
    • Streamlined exterior loops for hang drying or storage
    • Mesh storage sack and nylon stuff sack


    Many sleeping bags are rated for temperature by an independent testing protocol. REI and the broader industry now use the International Organization for Standardization (ISO) 23537 protocol, which improves on the older European Norm (EN) 13537 standard; you may still see older items in our assortment that were only EN tested. With either protocol, each bag gets a Comfort (or T-Comfort) rating and Lower Limit (or T-Limit) rating. The Comfort rating is the lowest temperature at which the bag will keep the average "cold sleeper" comfortable, and the Lower Limit rating is the lowest temperature at which the bag will keep the average "warm sleeper" comfortable. Ratings are based on a person wearing one long underwear layer and a pair of socks, sleeping on an insulated surface with a minimum R-value of 5.38. Many brands use the Comfort rating for women's bags and the Lower Limit rating for men's and unisex bags. Everyone's body and sleep comfort differ, and conditions of use (posture, clothing, sleeping pad R-value, wind, humidity, etc.) affect total insulation, so EN and ISO ratings are intended as a guideline to help you compare products, rather than a guarantee of warmth.
    View all Big Agnes Men's Sleeping Bags
  • Technical Specs

    Best Use


    Tested Lower Limit

    19 degrees (F) - EN

    Tested Comfort

    30 degrees (F) - EN

    Temperature Rating (F)

    30 degrees (F)

    Temperature Rating (C)

    -1 degrees (C)




    Ripstop nylon

    Zipper Location


    Insulation Type


    Water-Resistant Down



    850-fill-power DownTek water-repellent down


    Ripstop nylon

    Sleeping Bag Shape


    Stuff Sack Size

    7.5 x 15 inches

    Stuff Sack Volume

    10.86 liters




    Contains recycled materials

  • Reviews
    2 reviews with an average rating of 5.0 out of 5 stars

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