The REI Co-op Trailmade 20 Sleeping Bag is a synthetic mummy bag with a manufacturer rating of 20°F (roughly -7°C). Independent EN ISO 23537 testing puts the comfort rating at -1°C and the limit rating at -6°C — together with the marketed figure, these give a more realistic picture of where the bag stays comfortable versus where it only prevents hypothermia.
Fill weight is 992 g of 100% recycled, bluesign-approved polyester, and the shell adds a DWR finish for moisture resistance. It's built in a short-length cut for users up to 167 cm, with a 157 cm shoulder girth and 147 cm hip girth, a two-way zipper, and a contoured hood. Packed size is 33×25 cm (8.6 L), and at 1474 g total it sits on the heavier side for synthetic bags — typical of this insulation type, traded for lower cost and better wet-weather performance than down.
Between its price-to-performance ratio and PFC-free recycled materials, the Trailmade 20 suits 3-season backpacking and camping where reliability and value matter more than shaving pack weight.
Specifications
Comfort Temperature
-1 °C
Limit Temperature
-6 °C
Temperature Rating Standard
EN/ISO 23537 tested
Season Rating
3-season
Total Weight
1474 g (3.25 lb)
Fill Weight
992 g (2.19 lb)
Shoulder Width
157 cm (5.2 ft)
Hip Width
147 cm (4.8 ft)
Packed Size ( Length x Diameter )
33 x 25 (1.1 x 9.8 ft)
Packed Volume
8.6 l (2.27 gal)
Insulation Type
Synthetic
Shape
Mummy
Zipper Side
Left
Zipper Length
Full length
Two-Way Zipper
✓
Shell Fabric
Recycled bluesign polyester with DWR
Water Resistance
DWR treated
Draft Tube
✓
Hood Type
Fitted/contoured
Internal Pocket
✓
Stuff Sack Included
✓
Size Category
Short
Maximum User Height
167 cm (5.5 ft)
Gender-Specific Fit
Unisex
Recycled Materials
✓
bluesign Certified
✓
PFC/PFAS Free
✓
Warmth-to-Weight Ratio f(x)
4.1 °C/kg
Fill Efficiency f(x)
0.6 °C/100g
Weight per Degree f(x)
245.7 g/°C
Bag Type
Mummy sleeping bag
Where to buy
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Category context Sleeping Bags (417 products)
Weight
Heavier end· mainstream zone 819–1420 g· ranked 328 of 418