Swipe for more images

Reactor™ 35 Mummy II Sleeping Bag


$54.98 $109.00
Style# 1525581
Greater Rewards members earn 550 points with purchase
Sizing Fits Slightly Small


    • Color
    • Size
    • REG
    • Dimension
    • LH
    • RH

Product Actions

Add to cart options
Add to Wishlist


Style# 1525581


The leanest and lightest of our Reactor series, the Reactor 35 weighs in at a scant 2 pounds—but it’s heavy on warmth thanks to our thermal reflective technology and heat-trapping Thermic MX insulation.

  • Omni-Heat thermal reflective lining traps your body heat while providing breathability
  • Omni-Shield advanced repellency protects you from rain and condensation in the tent
  • Stash pocket
  • Offset quilt construction to avoid cold spots
  • LH/RH zip together
  • 19” x 8” compression sack included
  • Thermic MX™ Insulation
  • Draft tube insulates your zipper to keep out the cold
  • EN T-Comfort: 51 degrees F, 10 degrees C
  • EN T-Limit: 43 degrees F, 6 degrees C
  • EN T-Extreme: 21 degrees F, -6 degrees C
  • Average weight: 35 oz
  • Fill weight: 16 oz
  • Regular fits 6’ person
  • Imported

  • Shell: Omni-Shield 100% nylon 30D micro ripstop
  • Lining: Omni-Heat thermal reflective Microtex
Omni-Heat™ Reflective
Thermal Reflective Warmth

Technology Videos

Play youtube video about Omni-Heat Reflective (tm)
Omni-Heat™ Reflective
Magic in a littlesilver dot.
Breathable material with little silver dots that reflect body heat.


Reactor™ 35 Mummy II Sleeping Bag 4 5 4 4
Good bag for the price, light and packable So far I've only used this bag during summer 50+ degree camping trips. It comes with a compression bag making it very small when packed and very light to carry. The material is comfortable and the Omni heat does seem to work well. I will be using it during winter months, from what I can tell it will be warm enough inside the tent. Overall the sleeping bag is comfortable but somewhat narrow compared to other bags I looked at (for 5' 10" female). This hasn't been an issue since I sleep with it unzipped. August 16, 2013
Met expectations This sleeping was a gift for my son. He used it the weekend after he recieved it on a boy scout camping trip. Actully he slept in it at home the day he got it. His review was that " it was real warm without being to hot" October 26, 2012
Not as I expected I used this one time, and it already has a snag in it, the inside padding is coming out. I'm sure I could fix it by sewing it, but it is frustrating. It also wasn't as warm as I thought it would be. I got cold in the middle of the night. The mummy style is always nice though. September 15, 2012
Can you feel the heat? I was gifted this sleeping bag during a press trip - under the condition that I hiked it out myself during a 10 mile ascent from the floor of the Grand Canyon up to the rim. The first test thing sleeping bag passed? It's light, compact, and easily transported. The reflective heat aspect is no joke. Seriously, this bad boy gets cookin'. Unfortunately for me, it doesn't stop working during the summertime. I would definitely not suggest taking this out as your sleeping bag during summer camping trips - you will be HOT. If you have no other choice, consider flipping it inside out (that's what I did, and it didn't get so warm). For how tiny this thing scrunches up, it expands surprisingly well and had a nice cushion to it. My favorite little detail? The pocket. All sleeping bags should have pockets! August 20, 2012
1-4 of 4

Size & Fit Guide

Size Chart

How to Measure

Columbia Fit Guide

How to Measure

  • Fold up at dotted line.
  • Place against a wall or other 90 degree surface.

    Place heel against fold/wall on flat level surface.
  • Mark the end of the longest toe with a pen or pencil.
  • Measure both feet and use the larger measurement.
  • Read measurement and compare to size chart.
  • When comparing on the size chart, determine the closest larger measurement and use that number to determine your shoe size for your country’s shoe measurement standard.

Shipping & Returns

Shipping & Returns

Shipping Information

Shipping Method Rate Expected Delivery Time
UPS Ground $6.00 3-7 Business Days
UPS 2-Day Air $12.00 2-3 Business Days
UPS Overnight $19.00 1-2 Business Days
Free Standard Shipping

Return Policy

Returns are accepted within 30 days of the purchase date online or in-store. Your apparel must be in original and unworn condition, with tags still attached. Footwear returns must also include the original box.

Still Have Questions

See our Customer Service section for more details. Visit Customer Service