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Trekking Sleeping Bag MT500 0 degrees Celcius - Polyester

Sale price: $65.00 Regular price: $79.99

Hood with good coverage, double collar, thick wadding: everything is designed to keep you warm in this sleeping bag! Ventilation provided by the 2 double-slider zips. Can be twinned.

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Sale price: $65.00 Regular price: $79.99

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Model: 8618871

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Product Features

A photo of the Trekking Sleeping Bag MT500 0 degrees Celcius - Polyester in use

Trekking Sleeping Bag MT500 0 degrees Celcius - Polyester | This sleeping bag was designed by our trekker-designers for bivouacking comfortably at night at temperatures greater than or equal to 0°C.

Hood with good coverage, double collar, thick wadding: everything is designed to keep you warm in this sleeping bag! Ventilation provided by the 2 double-slider zips. Can be twinned.

Optimal temperature

Comfort temperature: 0°C; limit temperature: -5°C. Synthetic padding

Easy to transport

For size L. Weight: 1670g. Volume: 15,2 litres. Stuff Bag

Sleeping comfort

Comfortable mummy shape. 2 x 3/4 zips with a double slider 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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634 Reviews
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Trekking Sleeping Bag MT500 0 degrees Celcius - Polyester,dark ivy green
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Warm & Comfy

I took this bag on a 3 day trek into the Redwoods where temps were expected to be in the low 30s F. I really like the design of this bag. I am side sleeper and most bags make me feel claustrophobic. All the adjustments, the two zippers and draft collar contribute to a good nights sleep. I really wish that Decathlon would use this design for a down bag because the only draw back was the weight & volume. I am happy to add this bag to my gear arsonal.


Slept on a 20 degree weather in a tent and this sleeping bag kept me very comfortable. The thing i wish it has a double slider zipper so you can choose where you may want to maintain an opening (sticking your foot out without having to unzip the whole zip) does that make sense.


The zipper isn’t good hard to zip, should use a better quality zipper

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quality is best

good for winter

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Is good but not enough

I bought this sleep bag for winter in Scotland and I was doing camping with 0 º and is not working I was cold.

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Sleeping bag

Comfy I'm 20,stone in weight I can at a squeeze manage to get in it's very good and very warm have use outside in December but for myself would go back and buy rectangular version of sleeping bag just for comfort of size

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Warm sleeping bag

Compacted size, cheap price

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Worth every penny

Bought for my 10 year old for a recent camping trip. The nights were chilly but he was cozy, and slept well every night. Would definitely recommend

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cold during Scottish summer

Usually a big decathlon fan but extremely disappointed with this sleeping bag. I was cold on a 9 degrees night and the material feels very cheap and uncomfortable to sleep in. Will be returning this item. My friend bought a 20 pound bag from Amazon, and I am sad to say it was better quality than mine.

Hi, thanks for taking the time to review our Forclaz Trekking Sleeping Bag 0c.

I'm sorry to hear that you had a bad experience with this product, the nights in Scotland can definitely be chilly, even in Mid-summer!

However the bag should be able to keep you warm in such conditions, to be honest I'm a little surprised, because I have a 0 degree rated Forclaz bag, although the Trek 900 Down version and in similar conditions find it too warm if anything!

I have a couple of suggestions to help keep you warm, such as using an appropriate insulating sleeping mat such as our Trek 100 Forclaz Foam Mattress. If there is a lot of space inside the bag this can also prevent the insulation from working properly, you can fill any excess space with spare clothes which should help. Wearing a thin hat, some warm socks and maybe a thin thermal base layer could also help. Also using a sleeping bag liner can improve slightly the thermal properties of the bag and also help keep it clean.

That being said, if you are unhappy with the bag I would invite you to pop in to your closest store, where I'm sure they could find a solution for you.

I'm sorry again to hear about your bad experience, I hope you managed to enjoy the rest of your trip!


Peter - Forclaz Product Expert, Decathlon UK



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Wing 你好,










Hiking and Trekking team

Excellent for long trips

I'm so glad for this sleeping bag, I used it for 3 week through mountains, and hills, and it was so great to feel warm at night. It was 3 degrees. It maintained the warmth inside the bag, allowing us to sleep very well all night .  It's water rezistent, and it's very good especially when you are in the UK where in the morning you wake up in the tent, and all the tent is wet inside.  And one nice advantage if you go with your partner, you can zip 2 bags together, and it's very comfortable, you can warm up,when you just sit in a tent, or watch a movie. But I would recommend sleeping separately in bags, because while you sleep the cold air comes through the hole between bodys.I would recommend this sleeping bag because I tried more than 3 bags, and no one is better than this one.   Thank you Decathlon


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Nice sleeping bag, when temperature is more cold you also need blankets with it for extra warmth. But it's good quality material, light, and transportable.

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Nice 👍

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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?

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.


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 72 cm, height at the feet 34 cm in size L. 64/30 in S, 68/32 in M, 76/36 in XL.

Weight and dimensions

Size S: 1450 g, user up to 1.59m tall. Bag dimensions: L 42 cm Ø 19.5 cm. Volume 12.5 L.Size M: 1550 g, user from 1.60m to 1.69m tall. Bag dim.: L 42 cm Ø 20.5 cm. Volume 13.9 L.Size L: 1670 g, user from 1.70m to 1.84m tall. Bag dim.: L 42 cm Ø 21.5 cm. Volume 15.2 litres. Size XL: 1790 g, user from 1.85m to 2m tall. Bag dim.: L 42 cm Ø 22.5 cm. Volume 16,7 L. Volume & dimensions may vary according to the compression applied to the product.


Ergonomic hood with drawcord.Double collar for protection from the cold.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 115 gr/m2, 100% polyester (70% recycled),- and one 150 gr/m2, 100% polyester (70% recycled).The wadding is made from silicone-coated spiral fibres that make it highly compressible and highly durable. Despite its low thickness, it has high insulation properties thanks to the air trapped inside, and remains lightweight.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 ”Ultralight” and 2018 ”Light” 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.



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