REI Co-op  Zephyr 25 Recycled Sleeping Bag - Women's

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Ideal for 3-season backpacking, the women's REI Co-op Zephyr 25 recycled sleeping bag is our top synthetic design—light, compressible, cozy, and now with recycled materials throughout.

Location Image of color Blue ClayLocation Image of color Blue Clay
Location Image of color Blue Clay


  • Women-specific design offers more room in the hips and a slightly narrower shoulder girth for the best fit and thermal efficiency
  • 100% recycled synthetic polyester insulation is durable and highly compressible; the fill also retains some insulating ability if it gets wet
  • Shingle construction on top provides uniform loft and prevents insulation from shifting and creating cold spots
  • Offset quilt construction on the bottom optimizes bag/pad system warmth while reducing unnecessary weight and bulk
  • Mummy shape is thermally efficient, yet roomy enough from shoulder to knee to ensure sleeping comfort
  • Trapezoidal footbox gives room to wiggle toes and the baffle in the toe box holds extra insulation in place to help keep feet warm
  • Hood, insulated muffler and full-length zipper draft tube keep warmth in and cold out; hood conforms to the head and can accommodate a backpacking pillow
  • Zipper cover and internal antisnag strip combine for easy zipping
  • Stash pocket under collar holds small essentials
  • Differentiated drawcords allow quick hood and neck adjustments in the dark
  • 100% ripstop recycled polyester shell offers durability with abrasion- and tear-resistance for years of use
  • Durable water repellent (DWR) finish on shell helps keep bag from getting damp if it comes in contact with condensation on tent walls
  • 100% recycled nylon liner is soft and silky for freedom of movement
  • Nylon stuff sack and polyester storage bag are included
  • 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
  • Contains materials that meet the bluesign® criteria


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 the REI Co-op Zephyr Product LineView all REI Co-op Backpacking Sleeping Bags

Technical Specs

Item #202999
Best Use


Tested Lower Limit

15 degrees (F) - ISO

Tested Comfort

26 degrees (F) - ISO

Temperature Rating (F)

25 degrees (F)

Temperature Rating (C)

-3.9 degrees (C)


Ripstop recycled polyester (bluesign® approved)

Zipper Location


Insulation Type



Recycled polyester fibers


Recycled nylon (bluesign® approved)

Sleeping Bag Shape


Shoulder Girth (in.)

60 inches

Hip Girth (in.)

59 inches




Contains materials that meet the bluesign® criteria

Contains recycled materials

From a Climate Neutral Certified brand

17 reviews with an average rating of 3.6 out of 5 stars

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