REI Co-op  Flash Sleeping Bag

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This 3-season, ultralight sleeping bag uses a clever design of water-repellent down and synthetic insulations and waterproof / breathable fabric panels for double the protection.


  • With a European Norm (EN) lower-limit rating of 29°F, this bag is suitable for 3-season use
  • REI double-protection design combines water-repellent fills with waterproof / breathable fabric at the hood, sides and footbox, the areas most likely to touch a damp tent wall
  • On top of the bag, where superior loft and warmth are key, the bag is filled with water-repellent 700-fill-power duck down
  • On the bottom is resilient Primaloft® Sport insulation, which performs well in a compressed under-bag space
  • Ripstop nylon shell also features a durable water repellent finish to further protect the bag's insulations
  • Performance fit keeps weight low and thermal efficiency high
  • REI in-the-round design puts vertical baffles in side walls to wrap you in warmth and create a better fit than bags that use only horizontal baffles
  • Contoured hood, insulated face muffler and full-length draft tube all work to keep warmth in
  • Differentiated hood and neck drawcords simplify adjustments; antisnag zipper works smoothly
  • Most REI backpacking bags can be zipped to other REI backpacking bags; women's bags zip on the right, unisex on the left
  • The REI Flash Sleeping Bag includes a nylon stuff sack and a large cotton storage bag
  • REI is Climate Neutral Certified; as we work to actively reduce our footprint, we measure annual carbon emissions and purchase an equivalent amount of verified carbon credits


Temperature ratings are intended as a guideline to help you compare products, rather than a guarantee of warmth, since many different factors contribute to your comfort while you sleep. Our backpacking bags are rated for temperature according to an independent testing protocol: International Organization for Standardization (ISO) 23537. Testing is based on a person wearing one base layer and a pair of socks, sleeping on an insulated surface with a minimum R-value of 5.38.

Each bag then gets 2 ratings: 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. For REI Co-op brand nongendered sleeping bags, we provide an overall temperature rating that falls between the Comfort and Lower Limit ratings.
View all REI Co-op Backpacking Sleeping Bags

Technical Specs

Best Use


Tested Lower Limit

29 degrees (F) - EN

Tested Comfort

41 degrees (F) - EN

Temperature Rating (F)

29 degrees (F)

Temperature Rating (C)

-1.7 degrees (C)




Ripstop nylon

Zipper Location


Insulation Type


Water-Resistant Down



700-fill duck down (top) and PrimaLoft Sport (bottom)


Nylon taffeta

Sleeping Bag Shape


Stuff Sack Size

7.5 x 15 inches

Stuff Sack Volume

11 liters




Down certified to the Responsible Down Standard (RDS)

From a Climate Neutral Certified brand

53 reviews with an average rating of 4.2 out of 5 stars

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