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Forclaz MT500 59°F Polyester Sleeping Bag

Sale price: $59.99 Regular price:

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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Sale price: $59.99 Regular price:

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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
Model: 8618864

Product Features

A photo of the Forclaz MT500 59°F Polyester Sleeping Bag in use
A photo of the Forclaz MT500 59°F Polyester Sleeping Bag in use

Forclaz MT500 59°F Polyester Sleeping Bag | Our designers, who are all trekking enthusiasts, designed this sleeping bag to sleep comfortably in a bivouac at temperatures above or equal to 59°F (15°C).

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.

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


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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used in bivouac, even if I'm cold I think that 15 degrees is just... very light and compact. perfect in this aspect.

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Good product, good weight and excellent volume

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Sleeping bag


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Fully meets up to 15 °C. Under 10, the woman was already cold. I warmed up with my own heat!!!

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sleeping bag

very good quality

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I use it to make…

I use it to do the Camino de Santiago. It is very light, does not take up much space in the bag. It keeps you warm. Best compact duvet I have.

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The storage size is not big, the inner layer is just right when wearing long sleeves and long pants at 15 degrees Celsius, it is very warm.

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Lightweight, compact but noisy

Very light and very compact, ideal for transport On the other hand, noisy when creasing and zipper which gets stuck easily

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Super light, fits in a small space, warm enough, and easy to pack back. The only thing I don't understand is why it narrows below the knee, since the difference in material would be minimal, but this design slightly worsens the feeling of comfort.

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Good sleeping bag for summer

Very compact. I mainly use it in the summer. The format is pleasant, it stores quite easily in its cover. May be a little expensive

Alright !

Alright !

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light and practical sleeping bag

light bag easy to fit in your backpack for walks lasting several days, however the sarcophagus is always painful when you move at night

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Compact size

Compact size is important when you need to travel by plane. I can have everything packed into the backpack.

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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.

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.


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.


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 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.




Size Guide Visual

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