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Details

  • With a European Norm (EN) lower-limit rating of 20°F, this bag is suitable for 3-season use
  • Synthetic polyester insulation is durable and highly compressible; the fill also retains some insulating ability if it gets wet
  • Shingle construction with overlapping layers distributes insulation evenly and prevents cold spots
  • Equally distributed insulation accommodates the multiposition sleeper; mummy shape is thermally efficient, yet roomy enough for sleeping comfort
  • Durable ripstop nylon shell is water- and abrasion-resistant; nylon taffeta lining is soft and resists tears
  • Relaxed fit through the shoulders and hips gives you room to move
  • Contoured hood, insulated face muffler, roomy footbox and full-length zipper draft tube work together to keep heat in and cold out
  • Bag has a stash pocket under the collar
  • Pad loops provide attachment points to keep your sleeping bag and pad together (sleeping pad not included)
  • Anti-snag zipper slider delivers swift and smooth zipping
  • Differentiated drawcords (1 round, 1 flat) allow quick hood and neck adjustments in the dark
  • Nylon stuff sack and mesh/nylon storage bag included

Imported.

Many sleeping bags are rated for temperature by an independent testing protocol, the European Norm (EN) 13537. Each bag gets two ratings: a Comfort rating and Lower limit rating. The Comfort rating is the lowest temperature at which the bag will keep the average woman (or "cold sleeper") comfortable, and the Lower Limit rating is the lowest temperature at which the bag will keep an average man (or “warm sleeper”) comfortable. Everyone's body and sleep comfort is different, so EN Ratings are merely a guideline to help you compare products.

View all REI Co-op Men's Sleeping Bags

REI membership

Specs

Best Use Backpacking
EN Lower Limit 20 degrees Fahrenheit
EN Comfort 31 degrees Fahrenheit
Temperature Rating (F) 20 degrees Fahrenheit
Temperature Rating (C) -4 degrees Celsius
Weight
Long Left
2 lbs. 11 oz.
Long Left Wide
2 lbs. 14 oz.
Regular Left
2 lbs. 8 oz.
Shell Ripstop nylon
Zipper Location Left
Insulation Type Synthetic
Fill Polyester fibers
Lining Nylon
Sleeping Bag Shape Mummy
Fits Up To (in.)
Long Left
78
Long Left Wide
78
Regular Left
72
Shoulder Girth (in.)
Long Left
62
Long Left Wide
70
Regular Left
62
Hip Girth (in.)
Long Left
58
Long Left Wide
66
Regular Left
58
Stuff Sack Size
Long Left
7 x 15
Long Left Wide
7 x 15
Regular Left
7 x 15
Stuff Sack Volume
Long Left
10 liters
Long Left Wide
15 liters
Regular Left
10 liters
Compressed Volume
Long Left
8.4 liters
Long Left Wide
10.9 liters
Regular Left
7.8 liters
Gender Unisex

Our backpacking bags come in three fits.

This bag is regular.


REI Co-op brand sleeping bag fit guide

Fitted

Narrow profile for more warmth and less weight.

Regular

Wider cut provides wiggle room while retaining warmth.

Relaxed

Roomy shape prioritizes comfort.


See specs for additional sizing information.

Illustration of three shapes of backpacking sleeping bags: fitted, regular and relaxed.
Rated 5 out of 5 by from Lightweight and super great It was almost too warm for a quick overnight backpacking trip here in Southern California, but it was fantastic. Small and light enough that it didn't make my pack obnoxious to carry and it held heat like a champ. This thing is rad and the price is definitely right.
Date published: 2017-04-28
Rated 4 out of 5 by from nice all around bag I purchased this for camping with my son and it has not disappointed. Great all around bag
Date published: 2017-05-09
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The stuff is pretty difficult to put the sleeping bag in. What size stuff sack would you suggest to get to make it an easier fit.

Asked by: Outdoor explorer
The long and regular use a 10 liter stuff sack and the long wide will fit in a 15 liter stuff sack.
Answered by: REIservice
Date published: 2017-05-10

Does this zip together with the REI Joule?

Asked by: alwayssunnyinsd
​Yes, the Lumen 20 can be zipped into the Joule.
Answered by: REIservice
Date published: 2017-04-26

Dear REI experts, I just purchased the long left wide version. What liner would you recommend? Not necessarily to increase heat, but rather to keep clean. Thank you!

Asked by: DanB
The mummy Sea to Summit CoolMax Adaptor Liner is a great choice if you are not looking to add warmth to your Lumen. https://www.rei.com/c/sleeping-bag-liners
Answered by: REIservice
Date published: 2017-05-15

Does REI sell some kind of pillow to use with this bag? Possibly an inflatable one to save space. Getting used to sleeping without head support is difficult.

Asked by: Robert
Here is a link for our selection of pillows: https://www.rei.com/c/camping-pillows
Answered by: REIservice
Date published: 2017-06-12

Are you able to wash the Lumen 20 in a washing machine?

Asked by: Dave28
​Yes, you can wash this in your home washing machine.
Answered by: REIservice
Date published: 2017-06-12

Hi I am 6 foot or 6 foot one at the most. Would the Long be too excessive or should i keep it at the regular length

Asked by: Camper1000
If you want the most efficiency, choose the regular length. If you want extra room, choose the long.
Answered by: REIservice
Date published: 2017-05-10
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