Columbia Reactor 35 Mummy

1 review
5-star:   0
4-star:   1
3-star:   0
2-star:   0
1-star:   0



Lightweight and highly compressible bag. I have used…

Rating: rated 4.5 of 5 stars
Source: bought it new
Price Paid: $160


Lightweight and highly compressible bag.


  • Packs very small.
  • Water resistant (Omni-Shield)
  • Warms up fast (Omni-Heat)
  • Accurate temperature rating (at least for warm sleepers like me)
  • Lightweight
  • Nice zipper
  • Nice construction
  • Very reasonably priced


  • No loops for sleeping pad straps

I have used the bag down to 30°F and was warm wearing my UA Coldgear long sleeve and pants. I've slept in it in a t-shirt and underwear down to around 35°F.  There weren't any cold spots or drafts and the bag warms up very quickly with the Omni-heat lining, which I expected to be a gimmick.  

I'm 6-1 and the regular size bag fits me perfectly. Plenty of room in the shoulders and I can comfortable lay without touching either end of the bag, but close. Easy to get in and out of, the zipper is "snag-proof".  

The Omni-shield makes the bag water resistant, which works great for nights with heavy condensation if you use a single walled tent like I do. The bag compresses to be very small and weighs only 2lbs. The fabric it is made of seems very delicate, but my 70 lb catahoula moves around and sleeps on my legs at night and it doesn't even have a snag or hole anywhere from his nails after at least a dozen nights.

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Retailers' Descriptions

Here's what other sites are saying:

Columbia Reactor 35F Synthetic Sleeping BagThis sleeping bag is fascinating, of the Columbia's Reactor series it is the leanest and lightest; weighing barely 2 pounds but offering tons of warmth thanks to its thermal reflective technology. The combination of Omni-Heat lining and Thermix MX insulation maintains body heat to keep you warm while preserving breathability on warm nights. It is designed to keep you comfortable all night by protecting you from the rain and condensation in your tent by using the Omni-Shield 100% nylon material. The Columbia Reactor 35F Synthetic Sleeping Bag is manufactured with a draft tube along the zipper preventing cold spot and has an offset quilt construction. But you ve got to love the trapezoid toe box which provides plenty of room for foot comfort. And all of this is easily rolled up, packed into a tiny sausage-like 7.5 in. x 17 in. stuff sack taking up no space whatsoever. The Columbia Reactor 35F Synthetic Sleeping Bag is designed to keep you comfortable on warm evenings, toasty on cold ones and most important of all, lightweight during the day when you are lugging it around your favorite national park.

- SunnySports

The Columbia Reactor 35 Degree Sleeping Bag is built to keep you comfortable on warm nights and is ultralight for when weight counts. Features Thermix MX synthetic insulation for warmth and an OmniHeat thermal reflective lining that traps and recirculates your body heat while providing breathability. A draft tube and face gasket help eliminate heat loss for a better night's sleep.Thermix MX InsulationFabric: 100% nylonOmniHeat thermal reflective liningOmniShield advanced repellency to keep out the wetOffset quilt constructionStash pocket for small itemsDraft tube along the zipper prevents it from becoming a cold spotFace gasket to prevent heat lossTrapezoid footbox provides plenty of room for foot comfortSleeping pad retention loopsMateableStorage sack included7.5" x 17" compression sack includedEN Rating:EN TComfort: 51 degrees F/10 degrees CEN TLimit: 43 degrees F/6 degrees CEN TExtreme: 21 degrees F/6 degrees C

- Campmor

Columbia Reactor 35 Mummy Ii Sleeping Bag - Long Reactor 35 Mummy II Sleeping Bag - Long

- Columbia

Stuffed with cozy Thermix MX insulation and covered with an entirely nylon shell with Omni-Heat thermal reflective lining on the inside, the Columbia Reactor 35 Degree Mummy Sleeping Bag keeps you warm, comfortable and protected from the elements. For cold to moderately cool camping temperatures (the bag is comfort rated from 21 to 51 degrees Fahrenheit), this lightweight mummy bag with offset quilt construction and sleeping pad retention loops comes equipped with a secondary collar around the neck to keep drafts out and keep your core temperature where it should be. Come nightfall, zip into the Columbia Reactor 35 Degree Mummy Sleeping Bag and know you're set.

- Altrec Outlet