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Forclaz MT500 50°F Polyester Sleeping Bag

Sale price: $74.99 Regular price:

This very compact and lightweight mummy bag is perfect for summer use. You'll love its 2 side zips with a double slider for optimal ventilation. Can be twinned.

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Sale price: $74.99 Regular price:

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San Francisco, 735 Market St. Options

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About this item:

  • Comfort Temperature: 10°C I Temperature Limit: 41°F/5°C I Synthetic padding
  • Size L Weight: 2 lbs (970 g) I Volume: 7.9 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: 8618866

Product Features

A photo of the Forclaz MT500 50°F Polyester Sleeping Bag in use
A photo of the Forclaz MT500 50°F Polyester Sleeping Bag in use

Forclaz MT500 50°F Polyester Sleeping Bag | Our designers, who are all trekking enthusiasts, designed this sleeping bag to sleep comfortably at temperatures of 10C or above.

This very compact and lightweight mummy bag is perfect for summer use. You'll love its 2 side zips with a double slider for optimal ventilation. Can be twinned.

Optimal temperature

Comfort temperature 10°C, limit temperature 5°C. Synthetic padding

Easy to transport

For size L. Weight: 970g. Volume: 7.9 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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Excellent, holds the temperature perfectly, easy to close and the external laces allow you to compress it a lot.

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Use during a bivouac,…

Use during a bivouac, perfect!

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too cold to continue for 3 seasons

Halfway through the night and with thermal clothing on and the highest R number on the insulation mat, at NL temperatures, I wake up with a cold back. Am a side sleeper. I think this sleeping bag is suitable for summer night temperatures

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A little too narrow...

A little too narrow, especially if you are a bit heavy

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Best Product

Best product and Best price

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Zero forest, sleep well

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ok for a bag…

ok for an extra bag at temperature >10°C. takes up little space.

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Very nice sleeping bag, warm, great color

very nice, sleeping bag. checked at about 20 degrees, it was really warm there. They zipped it up ok, the cover was ok, it can be compressed nicely. I am very satisfied

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Beautiful color and ease…

Beautiful color and easy to store

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Generally good

Quite a warm sleeping bag. It takes up little space and is lightweight

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Best bit of decathlon kit I have.

Very cozy and lightweight sleeping bag. Took round Scotland for 5 days. Temps were in the 6° range most nights and with my sleeping mat and jumper, I was still cozy. At this price point its great and only 1kg. It packs down relatively small also. My GF has even been using it round the house.

Light and comfortable

Light and comfortable

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Take a size…

Take a size larger when you have to sleep fully clothed

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Conforms to the description,…

Conforms to the description, suitable for a tall person, 1m84

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not practical for a…

not practical for a small person

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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.Shoulder width 70 cm, height at feet 32 cm in size L, 62/28 in S, 66/30 in M, 74/34 in XL

Weight and dimensions

Size S: 790 g, user up to 1.59m tall. Bag dimensions: L 33 cm Ø 15.5 cm. Volume 6.2 L.Size M: 890 g, user from 1.60 to 1.69m tall. Bag dim.: L 33 cm Ø 16.5 cm. Volume 7.1 L.Size L: 970 g, user from 1.70m to 1.84m tall. Bag dim.: L 33 cm Ø 17.5 cm. Volume 7.9 L.Size XL: 1040 g, user from 1.85m to 2m tall. Bag dim.: L 33 cm Ø 18.5 cm. Volume 8.9 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 overlapping layers of 100% polyester wadding of 60 g/sqm.It retains 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.



Law label information

Size S, click here to see the product label
Size M, click here to see the product label
Size L, click here to see the product label
Size XL, click here to see the product label


Size Guide Visual

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