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Forclaz Backpacking Sleeping Bag MT500 41°F - Polyester

Sale price: $89.99 Regular price:

Well protected by its anatomical hood that can be adjusted with a drawstring, you will appreciate the comfortable width at the shoulders. Ventilation provided by the 2 double-slider zips.

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Sale price: $89.99 Regular price:

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About this item:

  • Comfort Temperature: 41°F/5°C I Temperature Limit 32°F/0°C I Synthetic padding
  • Size L Weight: 2.6 lbs (1200 g) I Volume: 11.3 L I Stuff Bag
  • Comfortable mummy shape. 2 x 3/4 zips with a double slider for ventilation.
  • Water repellent: Outer surface of the fabric is treated
Model: 8618867

Product Features

A photo of the Forclaz Backpacking Sleeping Bag MT500 41°F - Polyester in use
A photo of the Forclaz Backpacking Sleeping Bag MT500 41°F - Polyester in use

Forclaz Backpacking Sleeping Bag MT500 41°F - Polyester | This sleeping bag was designed by our trekker-designers for bivouacking comfortably at night at temperatures greater than or equal to 5°C.

Well protected by its anatomical hood that can be adjusted with a drawstring, you will appreciate the comfortable width at the shoulders. Ventilation provided by the 2 double-slider zips.

Optimal temperature

Temperature rating 5°C, temperature limit 0°C. Synthetic padding

Easy to transport

For size L. Weight: 1200g. Volume: 11,3 litres. Stuff Bag

Sleeping comfort

Very comfortable mummy shape. 2 x 3/4 zips with a two-way cursor for ventilation


Can be twinned with other models from the Forclaz MT500 range

Water repellent

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

Questions & Answers

Product Customer Reviews

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easy to carry

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It's a pity that it can't be used as a quilt cover

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Good product

Good product

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Sleeping bag

It is very practical.

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top performance! we could dream of being more compact but for the price it's already very good

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Only 12/15 Degree Product

This sleeping bag does not work, in below 15 degree temperature. I have used this sleeping bag regular 30 days during camping in winter but result is not same as per mentioned.



A good bag of…

A good sleeping bag

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High CP value

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perfect for trekking

We used this sleeping bag on the Torres del Paine O circuit in March of this year without problems, it is light and comfortable so we can carry it for several days, if it is complemented with a liner even better

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Quality bag for the buck

Quality sack, very compact and just the right size provides excellent comfort. The different sizes are a prerequisite for fewer air pockets for cold air, and with a smaller volume, better insulation is achieved. The hood ties can narrow the breathing hole according to individual needs. An excellent three-season sack for our temperate climate and northern summers.

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Good quality bag

Good quality bag, very nice fabric

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There is a good quality price relation.

Easy to carry, maintains temperature and comfortable to sleep

Down for bivouac

Perfect. Warm and pleasant. The size is perfect. Rather light for XL.
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Additional Product Information


Padding: 100.0% Polyester ; Main fabric: 100.0% Polyester ; Carry bag: 100.0% Polyester ; Lining: 100.0% Polyester

What is the temperature rating?

All our sleeping bags display the temperature ratings, tested by an independent laboratory (AITEX), in accordance with the European standard NF 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.


A generous mummy shape that is wide at the shoulders and narrow at the feet to optimise thermal insulation (no heat loss) and make the product more compact, while maintaining some freedom of movement.Width at the shoulders 70 cm, height at the feet 32 cm in size L. 62/28 in S, 66/30 in M, 74/34 in XL.

Weight and dimensions

Size S: 980 g, user up to 1.59m tall. Bag dimensions: L 40 cm Ø 17 cm. Volume 9.1 L.Size M: 1100 g, user from 1.60m to 1.69m tall. Bag dim.: L 40 cm Ø 18 cm. Volume 10.2 L.Size L: 1200 g, user from 1.70m to 1.84m tall. Bag dim.: L 40 cm Ø 19 cm. Volume 11.3 L. Size XL: 1290 g, user from 1.85m to 2m tall. Bag dim.: L 40 cm Ø 20 cm. Volume 12.6 L.Volume & dimensions may vary according to the compression applied to the product.


Ergonomic hood with drawcord.A baffle along the zips prevents heat loss.Double-slider zips for optimal ventilation.The top of the sleeping bag can be opened with the two side zips.

Want to know more about the wadding?

We use 2 layers of overlapping wadding: - One 60 gr/m2, 100% polyester -and one 115 gr/m2, 100% polyesterIt has the advantage of keeping its warmth even when wet.


Can be twinned with all the Forclaz MT500 sleeping bag models.Can be twinned with the older models in the 2017 InchUltralight Inch and 2018 InchLight Inch ranges.

Product testing

All our sleeping bags undergo mechanical tests that test the performance and resistance of the sleeping bag to guarantee better sleep and recuperation (thermal resistance, resistance to abrasion, comfort, etc). We also carry out many tests in the field, in real conditions.

Storage instructions

You can easily store your bag by stuffing it loosely into its cover, feet section first. To keep it fluffed up & ensure good thermal performance, remove from its cover, extend, store it in a dry place.




Size Guide Visual

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