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The REI Co-op Zephyr 25 is our top REI Co-op brand synthetic sleeping bag, ideal for backpacking from spring through fall. A new extended range of sizes delivers your best fit for better sleep.
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| 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 | Short Narrow |
| Short | 2 lbs. 12 oz. |
| Medium Narrow | 2 lbs. 13 oz. |
| Medium | 3 lbs. |
| Medium Wide | 3 lbs. 3 oz. |
| Long Narrow | 3 lbs. 2 oz. |
| Long | 3 lbs. 4 oz. |
| Long Wide | 3 lbs. 8 oz. |
| Shell | Recycled ripstop nylon (bluesign approved) |
| Zipper Location | Left |
| Insulation Type | Synthetic |
| Fill | Recycled PET polyester |
| Fill Weight | Short Narrow |
| Short | 2 lbs. 0.4 oz. |
| Medium Narrow | 2 lbs. 1.4 oz. |
| Medium | 2 lbs. 3.5 oz. |
| Medium Wide | 2 lbs. 5.4 oz. |
| Long Narrow | 2 lbs. 5.5 oz. |
| Long | 2 lbs. 6.7 oz. |
| Long Wide | 2 lbs. 9.8 oz. |
| Sleeping Capacity | 1-person |
| Lining | 20-denier recycled nylon (bluesign approved) |
| Sleeping Bag Shape | Mummy |
| Fits Up To (in.) | Short Narrow |
| Short | 65 inches |
| Medium Narrow | 71 inches |
| Medium | 71 inches |
| Medium Wide | 71 inches |
| Long Narrow | 77 inches |
| Long | 77 inches |
| Long Wide | 77 inches |
| Shoulder Girth (in.) | Short Narrow |
| Short | 65.5 inches |
| Medium Narrow | 59 inches |
| Medium | 66.5 inches |
| Medium Wide | 74 inches |
| Long Narrow | 60 inches |
| Long | 67.5 inches |
| Long Wide | 75 inches |
| Hip Girth (in.) | Short Narrow |
| Short | 56 inches |
| Medium Narrow | 49.5 inches |
| Medium | 57 inches |
| Medium Wide | 65.5 inches |
| Long Narrow | 50.5 inches |
| Long | 58 inches |
| Long Wide | 66.5 inches |
| Stuff Sack Size | Short Narrow |
| Short | 7.75 x 12.5 inches |
| Medium Narrow | 7.75 x 12.5 inches |
| Medium | 7.75 x 12.5 inches |
| Medium Wide | 7.75 x 12.5 inches |
| Long Narrow | 7.75 x 12.5 inches |
| Long | 7.75 x 12.5 inches |
| Long Wide | 8.25 x 14.5 inches |
| Stuff Sack Volume | Short Narrow |
| Short | 10 liters |
| Medium Narrow | 10 liters |
| Medium | 10 liters |
| Medium Wide | 10 liters |
| Long Narrow | 10 liters |
| Long | 10 liters |
| Long Wide | 12.5 liters |
| Compressed Volume | Short Narrow |
| Short | 7.3 liters |
| Medium Narrow | 7.8 liters |
| Medium | 8.3 liters |
| Medium Wide | 8.7 liters |
| Long Narrow | 8.8 liters |
| Long | 8.9 liters |
| Long Wide | 10.3 liters |
| Gender | Unisex |
| Sustainability | Contains materials that meet the bluesign® criteria |
| Contains recycled materials | |
| From a Climate Neutral Certified brand |
