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Forclaz MT900 32 degrees Farenheit 0 degrees Celcius Down Sleeping Bag

Sale price: $199.00 Regular price:

This sleeping bag is warm and light thanks to the loft (800 CUIN) of the down used, and is also very compressible. Mummy shape and adjustable hood with good coverage and a drawstring.

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Sale price: $199.00 Regular price:

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About this item:

  • Comfort Temperature: 32°F/0°C I Temperature limit: 23°F/-5°C
  • Size L Weight: 1.5 lbs (700 g) I Volume: 4.9 L I Stuff Bag Included
  • RDS ethical down with a fill power of 800 CUIN
  • Water repellent: Outer surface of the fabric is treated
  • Mummy shape, anatomical hood. 1 long zip on the left with a double slider
Model: 8618873

Product Videos

Product Features

Forclaz MT900 32 degrees Farenheit 0 degrees Celcius Down Sleeping Bag | With this RDS certified 3-season down and feather sleeping bag, you can sleep comfortably at temperatures down to 32°F/0°C.

This sleeping bag is warm and light thanks to the loft (800 CUIN) of the down used, and is also very compressible. Mummy shape and adjustable hood with good coverage and a drawstring.

A photo of the Forclaz MT900 32 degrees Farenheit 0 degrees Celcius Down Sleeping Bag in use

Optimal temperature

Comfort Temperature: 32°F/0°C I Temperature limit: 23°F/-5°C. ISO 23537

Easy to transport

Size L Weight: 1.5 lbs (700 g) I Volume: 4.9 L I Stuff Bag Included

Sleeping comfort

Mummy shape, anatomical hood. 1 long zip on the left with a double slider

Water repellent

Outer surface of the fabric is treated so that water runs off the surface


RDS ethical down with a fill power of 800 CUIN. 90% down/10% feathers


non-twinnable sleeping bag

Questions & Answers

Product Customer Reviews

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448 Reviews
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Size correctly, comfortable (…

Size correctly, comfortable (thickness and warmth). Easy to carry

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I used this bag...

I used this bag for a week of motorcycle riding, we didn't reach 0°C but it didn't disappoint! Comfortable, easy to store and compact, it will accompany me for a long time!!!

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Well done !

Well done !

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Torn / Tight Fit Carrying Case

Down at a pleasant temperature. Cover torn at the drawstrings at the end of the third exit. (Cover ordered through customer service) Down cut offering little mobility.


As someone who is cold, I was able to sleep and feel warm, despite the humidity outside and the negative temperatures! In addition to that, it is light and does not take up much space. It's an investment

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Very good I recommend

Very good I recommend

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sleeping bag

decent bag for april to october with a good sleeping mat

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Feather sleeping bag

Great, warm sleeping bag. I'm excited. I sleep very well in it.

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used only once...

used only once but very good value for money

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Totally fit, I...

Totally adapted, I didn't feel cold at -3, so perfect.

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What a desappointment !

I bought this bag (or its ancestor) in 2017 hoping it would last... but it became unusable! When I bought this sleeping bag by investing €200, I thought I could keep it for at least 10 years to make it profitable. Unfortunately, I will probably have to buy one again... Its strong points: The thermal quality of the product is undeniable, you can see the difference with a polyester product. The shape is comfortable. Its big flaws: the zipper is very very fragile. I pay attention to it, however, but after 1 to 2 years, it began to no longer allow the sleeping bag to be closed. In the mountains, in cold weather, in the dark, that's the last thing you want. Result: a few very cold nights! In addition, the feathers tend to come out of the bag so I wonder if the thermal quality is weakening. I used it intensely then about 2 to 3 times a year, especially in the mountains. Decathlon should consider offering the repair of this type of product, which is particularly qualitative/expensive!


Doesn't take up much space, is very good to use, the hood goes up quite high and is well maintained, keeps you warm.

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Sleeping bag

Used in spring and summer. Comfortable and warm, the hood encloses the head well and effectively protects against the ingress of cold air. Light and very compressible, takes up little space, ideal for bike packing.

Very good SdC Forclaz

Having a 10°C quilt and leaving all summer between 2500m and 3000m, not knowing my resistance to the cold at these altitudes I opted for this sarcophagus sleeping bag, my first one at that. Super happy with the MT900, it has successfully accompanied me on every journey since the end of spring without failing once! I had planned some thin but warm night clothes just in case, then when I realized that after a few dry, wet and/or windy nights the SdC was sufficient in itself to keep my body heat and I shed it extra weight for the rest of my journeys. Being used to the quilt of being able to move without discomfort during the night, I dreaded the passage to the sarcophagus and feeling "locked" inside without being able to move properly and after a little time of adaptation at the level of the feet /legs, a sarcophagus is narrow anyway and I was pleasantly surprised by the product. Most of the time, I fell asleep with the zip open and without a hood and if a little chill came to me, I just had to close the zip a little and be warm all night. The double zip is also good, you can open the bottom and let one leg out either to "cool down" or to "stretch". The little black spot for me coming from a quilt was the hood ah ah this hood which does not follow my movement while sleeping unlike my hat... Same, it's just a time of adaptation. I am satisfied with the MT900, it passes 0°C comfort without problem with a good insulating mattress underneath (the best sleeping bag will not do much for you if you are not well insulated from the ground) and its compactness is not bad . The duvet caught a few drops of water here and there and nothing came through or got wet. Same nothing on the outer layer in terms of humidity in the morning really a good product, well finished and well thought out in terms of materials. It may be missing an interior zipped pocket depending on each person's uses... The weight, not heavy but not that light either for feather down, an ideal mass/technique/price ratio in this segment would be for me technical/price for 800-850grs or mass/technical for 160e but the vagaries of recent years have hit... It is a good product, even great product for the technical sheet displayed, the felt experience and the segment with respect to the competition. I recommend this product especially since it "sold itself" to other people who were still thinking of old synthetic camping equipment sold by Decathlon... I still laugh about it when I think back to some backpacks hanging on the outside of old sleeping bags too bulky to fit into these!

Unbeatable value for money

I'm going to share my experience in the Alps, I've always been very hot, I've never closed it completely (temperatures around 5°C). The 0°C announced in comfort are real, provided you have an insulating mattress. Excellent sleeping bag, it takes up little space once compressed. Bit heavy. Very good value for money
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Additional Product Information


Filling: 90.0% Grey Duck Down, 10.0% Grey Duck Feather ; Lining: 100.0% Polyamide ; Main fabric: 100.0% Polyamide ; Carry bag: 85.0% Polyester, 15.0% Polyurethane ; Bag cover: 100.0% Polyester

What is the temperature rating?

We display the comfort temperatures on all our sleeping bags, tested by an independent laboratory (AITEX) in compliance with European standard ISO 23537-1:2022. The comfort temperature rating is the lower limit at which the user in relaxed posture is generally in thermal equilibrium and feels neither too cold nor too hot (for a standard woman in normal conditions of use). Choose your sleeping bag according to this criterion.

What is the temperature rating (lower limit at which you feel comfortable)?

The comfort limit temperature is the temperature limit at which a person curled up in the sleeping bag is in general thermal equilibrium, neither too cold nor too hot (determined for a man in normal conditions of use).We recommend using an insulation mattress to optimise your thermal comfort.

An important clarification concerning the iso 23537-1 standard

In the context of this standard, the measurement protocol of a sleeping bag’s thermal protection uses a mattress with thermal resistance equal to an R-value of 4.8.This means that by using a less insulating mattress, the thermal performance of your sleeping bag will be lower.We therefore recommend you use an insulating mattress to optimise your thermal comfort.

Some advice to consider before you get into your bag

Dress simply (1 layer of clothing is enough). Warm-up your extremities: hats, gloves, socks, hand/feet warmers, rubdowns, etc. A flask of hot water can be used as a hot water bottle (as long as there's no chance of it accidentally opening!) Contract your muscles (70% of the energy consumed is converted into heat) but do it without moving as this could create a draught. Use a bag liner to optimise warmth and avoid washing your sleeping bag too frequently.


The mummy shape optimises thermal insulation (no loss of heat because there is not much air flow or draughts) and saves space, which means that your movements are restricted.Width at the shoulders 72 cm, height at the feet 26 cm in size L.

Weight and dimensions

Size S: 750 g, user up to 1.60m tall. Bag dimensions: Ø 15 x 34 cm. Volume 6.1 Litres. 380 g of down/feathers.Size M: 850 g, user from 1.60m to 1.70m tall. Bag dimensions: Ø 16 x 34 cm. Volume 6.9 Litres. 440 g of down/feathers.Size L: 950 g, user between 1.7 m and 1.85 m. Bag dimensions: Ø 17 x 34 cm. Volume 7.8 Litres. 500 g of down/feathers.Size XL: 1050 g, user from 1.85m to 2m tall. Bag dimensions: Ø 18 x 34 cm. Volume 8.7 Litres. 560 g of down/feathers.


Anatomical hood with good coverage and drawstring adjustment.A baffle along the zip prevents heat loss.Double-slider zips for optimal ventilation.Brick baffle construction to reduce thermal bridges.

The advantages of a duck down and feather filling

The filling power of down has 3 advantages for mountain sports:- Thermal insulation thanks to the air trapped in the down and feathers- Ultra low weight: down is lighter than synthetic wadding while offering the same degree of warmth. This saves even more weight in your backpack- Ultra-compressible

How to measure the fill power of a down and feather wadding?

The fill power is a measure of the down's thermal insulation capacity and its potential to ”trap” air. It is expressed in CUIN (cubic inches).So, down with a higher fill power (higher CUIN number) will occupy more space, trap more air and provide greater thermal insulation.For this sleeping bag with its 90% down / 10% feathers filling, the fill power is guaranteed to be 800 CUIN or more (international IDFB standard).

Storage instructions

To maintain its fill power, which is necessary for its insulation properties, store your sleeping bag by stuffing it in the mesh bag provided, feet first. Can be stored flat.



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