How to Choose Sleeping Bags for Backpacking
REI Co-op On x BEAMS x REI Co-op Zephyr 25 Sleeping Bag
$199.95
Members get an est. $19.99 in rewards
Spring, summer or fall backpacking? Say hello to the On x BEAMS x REI Co-op Zephyr 25, a collaboratively designed special edition of our top REI Co-op brand synthetic sleeping bag.
Key Details
Fill
100% recycled PET polyester
Weight
Medium: 3 lbs.
Long: 3 lbs. 4 oz.
Compressed Volume
Medium: 8.3 liters
Long: 8.9 liters
Temperature Rating (F)
25 degrees (F)
- Part of the On x BEAMS x REI Co-op Collection of collaboratively designed apparel, trail-running shoes and camping gear
- This collab version of our Zephyr 25 sleeping bag sports the On x BEAMS x REI Co-op peak-to-peak-to-peak mark, celebrating iconic mountains from each brand's backyard range
- Semifitted mummy shape provides the roomiest fit of our backpacking bags, offering extra room in the knee area to enable a variety of sleeping positions
- Recycled shell and lining fabrics feature a durable water repellent (DWR) finish made without PFAS to help moisture bead up on the surface
- 100% recycled synthetic polyester insulation is durable and highly compressible; the fill also retains some insulating ability even if it gets damp
- Shingle construction on top provides uniform loft and helps prevent insulation from shifting and creating cold spots
- Offset quilt construction on the bottom optimizes bag/pad system warmth while reducing unnecessary weight and bulk
- Comfortable hood shape works well for all sleep positions and allows for easy integration with a backpacking pillow (not included)
- 2 differentiated drawcords make the hood easy to adjust while you're zipped in the bag
- Insulated muffler and full-length zipper draft tube keep warmth in and cold out
- Zipper path wraps around the front of your chest so you can more easily zip and unzip the bag; zipper cover and internal antisnag strip allow for frustration-free zipping
- Roomy trapezoidal footbox provides space to move your feet while still remaining warm and cozy
- Keep personal items close and easy to access in the interior stash pocket
- Includes a stuff sack for packing and a roomy mesh sack for breathable storage
- Hand-wash or machine wash warm, gentle cycle in front-load washer only; do not bleach; rinse thoroughly; do not wring; air dry or tumble dry low; do not iron or dry clean
- REI Co-op brand is certified to The Climate Label; we actively fund efforts to reduce carbon emissions across our business and support climate projects around the world
- Contains materials that meet the bluesign® criteria
Imported.
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 BagsEach 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.
| Best Use | Backpacking |
|---|---|
| Tested Lower Limit | 17 degrees (F) - ISO |
| Tested Comfort | 28 degrees (F) - ISO |
| Temperature Rating (F) | 25 degrees (F) |
| Temperature Rating (C) | -4 degrees (C) |
| Weight | Medium: 3 lbs. Long: 3 lbs. 4 oz. |
| Shell | 100% recycled ripstop nylon (bluesign approved) |
| Zipper Location | Left |
| Insulation Type | Synthetic |
| Fill | 100% recycled PET polyester |
| Fill Weight | Medium: 2 lbs. 3.5 oz. Long: 2 lbs. 6.7 oz. |
| Sleeping Capacity | 1-person |
| Lining | 100% recycled nylon (bluesign approved) |
| Sleeping Bag Shape | Mummy |
| Fits Up To (in.) | Medium: 71 inches Long: 77 inches |
| Shoulder Girth (in.) | Medium: 66.5 inches Long: 67.5 inches |
| Hip Girth (in.) | Medium: 57 inches Long: 58 inches |
| Stuff Sack Size | Medium: 7.75 x 12.5 inches Long: 7.75 x 12.5 inches |
| Stuff Sack Volume | Medium: 10 liters Long: 10 liters |
| Compressed Volume | Medium: 8.3 liters Long: 8.9 liters |
| Gender | Unisex |
| Sustainability | Contains materials that meet the bluesign® criteria Contains recycled materials From a Climate Label Certified brand |
Buying Advice
Better gear is built together
From feedback to field testing, all of our gear is dialed-in by REI Co-op members. Their adventures informed every stitch and detail—making for better, longer-lasting gear.
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