Product Colors and Sizes

  • Black Friday product
  • New Deal product
  • Cyber Monday product
  • Clearance product
  • Deal product
  • Best Seller product
  • Ecodesign product
  • New product
  • Staff Pick product
  • In The News product
  • Innovation product
  • product

Backpacking Sleeping Bag MT500 41°F - Polyester

Sale price: $45.00 Regular price: $69.99

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.

Color: Select a color
Size: Select a size

This product runs small

Sale price: $45.00 Regular price: $69.99

Free shipping over $49

Free returns

Free pickup

San Francisco, 735 Market St. Options

Select an available color and size to see options.

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

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

Skip to reviews
905 Reviews
Write a Review 
Backpacking Sleeping Bag MT500 41°F - Polyester, yellow ochre Image 11 of 10
Filtered by reviews Loading reviews…

Good buy, worth the price

Not a fan

Unfortunately I'm not a fan of the sarcophagus shape. It serves the feet so you have to open it from the bottom to take out at least one foot and have more range of movement. Who sleeps straight and still? In addition, the assembly with my husband's is not as practical as the rectangular shape. We are side by side but each stuck in our sleeping bag. Temperature level and lightness for transport is good. But the dream is also light in rectangular shape!

Warm and comfortable

There should be 4 tie rods to compress the bag and not 3.

icon-circle-checkmark verified purchase

Nice product

icon-circle-checkmark verified purchase
very comfortable

Nothing to say

icon-circle-checkmark verified purchase

Very good product, comfort and protection from the cold

icon-circle-checkmark verified purchase
Very good product in…

Very good product in value for money.

It was really good

icon-circle-checkmark verified purchase


icon-circle-checkmark verified purchase

Not a perfect item, sleeping Quality very bed

icon-circle-checkmark verified purchase
Very good product !

Very good product !

icon-circle-checkmark verified purchase
still a little thick...

still a little thick for high mountain hiking

icon-circle-checkmark verified purchase
A sleeping bag…

A sleeping bag in which you can choose the size, with a nice color and very good thermal qualities. Easy to carry with its small size. I recommend it especially as it is good value for money.

icon-circle-checkmark verified purchase
Fairly good

Despite being in a -3 zone, with thermal clothing and a blanket you won't get cold. It is comfortable and spacious, highly recommended


Skip to reviews

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 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 is 60 g/sqm, 100% polyester (90% recycled),- and one is 115 g/sqm, 100% polyester (70% recycled).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.



Superior quality. Unbeatable prices.

For 40 years, Decathlon has delivered the best value in the retail sports industry by offering high-quality, sustainable and cost-effective products.

Decathlon makes the difference
  1. product-research

    Research and development

    delivers high-quality cost-effective products

  2. State-of-the-art production processes

    minimize manufacturing costs

  3. Optimized supply chain

    reduces retail prices

  4. laptop-checkout

    Minimal retail footprint

    lowers overhead and indirect costs


Size Guide Visual

Please Sign In to Post Your Question

In order to notify you about the answer it is required to Sign In.

Sign In