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Backpacking Sleeping Bag MT500 141°F - Polyester
It is ultra compact and lightweight – perfect for summer use. The 2 side zips with double sliders provide optimal ventilation. This sleeping bag can be twinned.
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San Francisco, 735 Market St. Options
Select an available color and size to see options.
About this item:
- R-value of 4.8 I Comfort Temperature 59°F/15°C I Temperature Limit: 50°F/10°C I Synthetic padding
- Size L Weight: 1.5 lbs (680 g) I Volume 4.5 L I Stuff Bag Included
- Comfortable mummy shape. 2 x 3/4 zips with a double slider for ventilation.
- Water repellent: Outer surface of the fabric is treated
Product Features

Optimal temperature
Comfort temperature 15°C, limit temperature 10°C. Synthetic padding
Easy to transport
For size LWeight: 680 g. Volume 4.5 Litres. Stuff Bag
Sleeping comfort
Very comfortable mummy shape. 2 x 3/4 zips with a two-way cursor for ventilation
Compatibility
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
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Product Customer Reviews

Easily transportable on treks for example and keeps you warm.
Good light product
So happy
Light product to transport.
Hello, very light and easy to put back in its space-saving house, I just find the price a little expensive!
Very comfortable
Warm enough
Very good, small, compact and warm for occasional trips
Approx
Really not very hot.
Good for the price, its main drawback is that the fabric makes a little noise at night.
Used for a week on the GR34 this summer in wind and showers. It's very light, doesn't take up too much space in the backpack, and turned out to be quite warm and comfortable.
Beautiful material and very effective because it takes up little space in a backpack
Great for Normal Indian
Nickel
Additional Product Information
Composition
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.
Tips before getting 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.
Style
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: 590 g, user up to 1.59m tall. Bag dimensions: L 27 cm Ø 12.5 cm. Volume 3.3 L.Size M: 630 g, user from 1.60m to 1.69m tall. Bag dim.: L 27 cm Ø 13.5 cm. Volume 3.9 L.Size L: 680 g, user from 1.70m to 1.84m tall. Bag dim.: L 27 cm Ø 14.5 cm. Volume 4.5 Litres. Size XL: 740 g, user from 1.85m to 2m tall. Bag dim.: L 27 cm Ø 15.5 cm. Volume 5.1 L.Volume & dimensions may vary according to the compression applied to the product.
Functions
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 1 layer of 100% polyester wadding (90% recycled) of 60 g/sqm.It retains its warmth even when wet.
Compatibility
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.
Origin
Imported
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Backpacking Sleeping Bag MT500 141°F - Polyester
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Heavy products return policy
If you return a product you will receive a refund for the purchase price plus any applicable sales taxes, less any non-refundable charges.
Decathlon will cover all shipping costs associated with your return except for items excluded from our return policy such as bikes, basketball hoops, snowboards, surfboards, tents, and other larger / heavier items.
Return costs for heavy products:
Weight Thresholds | Shipping within California | Shipping outside of California |
---|---|---|
> 9 lbs | $20.00 | $25.00 |
> 30 lbs | $50.00 | $65.00 |
> 100 lbs | $100.00 | $125.00 |
> 200 lbs | $200.00 | $230.00 |
If you return a product at any of our store locations, we will gladly help you find the best alternative product or refund you on the spot.