Marmot Micron 40 Down Sleeping Bag

3.5°C Comfort Limit (EN13537:2012), 260g of 650 Fill Power Down (US Method)
Weighs 636g (Regular bag)
Code: SS18425V
  • Now £149.99
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The Marmot Micron 40 Sleeping Bag is a good option if your looking for a lightweight and compact down summer bag with a low price tag. This versatile bag can easily be zipped open to convert into a duvet. 

Marmot says:

Stay warm and cozy on your summertime adventure in the Micron 40. This summer bag is filled with water-resistant 650-fill-power goose down and has the ability to zip open and convert to a flat blanket with its full-length wrap-around zipper. Lightweight and durable, this easy-to-pack bag has an internal stash pocket.

The great thing about the Marmot Micron sleeping bags is that you've got a sleeping bag and duvet in one. You've even got the option of a hooded bag (micron 40) or non hooded bag (micron 50). Obviously the hooded Micron 40 version is warmer but for those who don't like the idea of anything around the head or just looking for a lighter summer bag then the Micron 50 would be ideal.

The Micron series bags feature a full length wrap around zipper that provides good ventilation and allows you to easily convert it into a duvet. They also have an additional shorter zip on the other side so you can get both your arms and shoulders out of the top easier while it's closed.

Overall a great down summer bag at a good price.

- Reviewed by Ultralight Outdoor Gear

Help and advice: Choosing a sleeping bag advice
  EN 13537 rating for sleeping bags explained
  Sleeping bag shape and sizes advice
  Sleeping Bag features Page 1
  Sleepin bag features page 2
  All about down filling in sleeping bags
  • Certified 650 fill power duck down with down defender to improve water resistance in wet conditions
  • Full length, wrap-around zipper provides great ventilation and ability to convert to flat blanket
  • Internal stash pocket
  • EN tested
  • Sewn-through baffles
  • Two hang loops
  • Stuff and storage sack included
Regular Long
  • Weight: 636g
  • Fill weight: 260g
  • Fit range: 6"/183cm
  • Interior length: 208cm
  • Shoulder: 152.4cm
  • Hip: 142cm
  • Foot: 101.6cm
  • Zip: LH
  • Stuff Sack dimensions: 15.24 x 30.48cm
  • Stuff sack volume: 5.6L
  • Weight: 710g
  • Fill weight: 330g
  • Fit range: 6.6"/198cm
  • Interior length: 223.5cm
  • Shoulder: 157.5cm
  • Hip: 147cm
  • Foot: 106.7cm
  • Zip: LH
  • Stuff Sack dimensions: 15.24 x 30.48cm
  • Stuff sack volume: 5.6L

EN Rating

  • Comfort limit: 46.4°F / 38.3°C
  • Lower comfort limit: 38.3°F / 3.5°C
  • Extreme limit: 12.2°F / -11°C


  • Shell: 20d 100% Nylon Mini Ripstop
  • Lining: 20d 100% Nylon Plain Weave
  • Insulation: 650 fill power duck down, PFC-Free Down Defender
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