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Reactor™ 25 Mummy II Sleeping Bag


$64.98 $129.00
Style# 1525571
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Sizing True to Size


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Style# 1525571


Built for medium to cold conditions, this performance sleeping bag is constructed with toasty Thermix insulation and a warmth-trapping Omni-Heat® lining. The soft shell material features advanced water repellency to keep you dry and comfortable.

  • 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
  • 17” x 9” compression sack included
  • Thermix MX™ Insulation
  • Draft tube insulates your zipper to keep out the cold
  • EN T-Comfort: 41 degrees F, 5 degrees C
  • EN T-Limit: 31 degrees F, -1 degrees C
  • EN T-Extreme: 3 degrees F, -16 degrees C
  • Average weight: 46 oz
  • Fill weight: 31 oz (regular), 34 oz (long)
  • Regular fits 6’ person, long fits 6’6” person
  • Imported

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

Technology Videos

Helps you stay clean and dry by resisting absorption of liquids.
Omni-Heat™ Reflective
Magic in a littlesilver dot.
Breathable material with little silver dots that reflect body heat.


Reactor™ 25 Mummy II Sleeping Bag 5 5 3 3
Could NOT be Happier! I LOVE this bag! Lightweight, packs pretty small, yet nice and toasty. Great for spring, summer, or fall. We'll see how it does in the winter. I'm a river guide so I live in my bag and needed something lightweight and functional. The amount of thought put into this bag's design is phenomenal. The omni-heat technology helps to keep the bag super warm while cutting down on mass, glow-in-the-dark zip pull makes it more user-friendly, but I think my favorite feature is the pocket on the outside of the bag. I sleep on my boat and listen to my iPod at night - I was always worried I'd roll over and the iPod would fall in the water, but no more worries! I love this bag and Columbia has a customer for life! :) August 31, 2012
This product is outstanding! Absolutely worth every penny!! The best for camping in AZ to MI!! Bonus features led me to this product and the description matches exactly to what you get...Amazing....so beyond what we thought!!! And we are not great camping people but these are well worth the weekends!!! Do not hesitate to purchase, there is nothing on the market like these!! January 13, 2014
Nice bag! This mummy bag is a really nice bag. First, the chartreuse isn't nearly as bright as it looks online, which I was happy about. It is very roomy for a mummy bag as so many these days are becoming borderline claustrophobic. It is a 3 seasons bag...maybe 4 if you are warm blooded. In 50 degree weather it was toasty warm with the Omni-Heat lining. Plus the price is right on this bag. I would definitely recommend it. April 26, 2013
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Size & Fit Guide

Size Chart

How to Measure

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