How to Choose Sleeping Bags for Backpacking
REI Co-op Trailbreak 20 Sleeping Bag - Men's
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The men's REI Co-op Trailbreak 20 sleeping bag gives the right balance of warmth, packability and weight for those breaking into backpacking and everything that comes with it.
Shop newer versionKey Details
Fill
Water-resistant polyester
Temperature Rating (F)
20 degrees (F)
- Water-resistant synthetic fill keeps insulating in damp conditions
- Comfortable mummy shape gives you freedom to move while you sleep
- 3-panel hood contours closely to your head to keep out cold air
- Face muffler and full draft tube keep out cold air
- Differentiated drawcords (1 round, 1 flat) let you adjust the hood and neck easily in the dark
- Offset quilt construction gives even coverage with no cold spots
- Durable water repellent (DWR) finish on the polyester shell resists moisture and stains
- Included stuff sack compresses for packing
- 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
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 Trailbreak 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 | 18 degrees (F) - ISO |
| Tested Comfort | 29 degrees (F) - ISO |
| Temperature Rating (F) | 20 degrees (F) |
| Temperature Rating (C) | -6 degrees (C) |
| Shell | Polyester |
| Insulation Type | Synthetic |
| Fill | Water-resistant polyester |
| Sleeping Bag Shape | Mummy |
| Shoulder Girth (in.) | 62 inches |
| Hip Girth (in.) | 56 inches |
| Stuff Sack Size | 9 x 16 inches |
| Stuff Sack Volume | 15 liters |
| Gender | Men's |
| Sustainability | 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.
