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Forclaz MT500 59°F Polyester Sleeping Bag

Sale price: $30.00 Regular price: $59.99

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: $30.00 Regular price: $59.99

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San Francisco, 735 Market St. Options

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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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Good product

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Choose it for summer nights

I use the 0 grade of the product in the winter and bought the summer version because it is incredibly comfortable. You can easily turn around inside and it is very good that it has a double zipper.

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A light and compact but cold sleeping bag

Very disappointed with this bag. Let's start with the positive: light and compact bag that fits easily in the bag. Regarding the negative: it is very cold. During my first use I was taken by surprise: it must have been 10-12°C and I only had a t-shirt (then I put on my fleece) and a hat, I wore a terrible night. Second outing (a hike of 4 days and 3 nights), I thought that I would be calm, that I had planned something to be warm, I had taken a long-sleeved t-shirt, a hat, a warmer to sleep in. neck, pajama bottoms and a big pair of socks. The nights were all between 10 and 15°C: not a single night did I sleep well, even on the mildest night. The comfort temperature is given at 15°C which insinuates that you can sleep comfortably in underwear and the limit temperature is 10°C, which should mean that you can not be too cold by dressing well . Nay! I would like to exchange it for the same bag but 5°C version!

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This compaction bag is very light, too...I was cold every time I used it and I understood: the padding was torn in several places and we only had the envelope on our back. 1 wash, 8 nights of use. It is noisy, and you must not move like any mummy bag....synthetic is not pleasant. Its storage and transport are great.

Good basic bag that’s light weight and perfect for bike trips.

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Used for 3 days...

Used for 3 days on bike packing in Tuscany. Just one night, a bit complicated.

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Perfect for a getaway

Perfect for a getaway

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The storage space is small, the temperature is suitable, and the color can be changed

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My first sleeping bag for bivouac, amazed by the quality and the ease of opening if you get too hot.

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Top product for price & performance ratio

Great sleeping bag for gravel bike tours!

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Good but plan a…

Good but bring a winter sleeping bag depending on the weather

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Expensive but practical

Expensive but practical

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It is ideal for sleeping under the sun during the holiday season

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Great product Be careful with its sensitivity to cold 0 degrees with clothing I will be neither hot nor cold paired with my partner! She, on the other hand, died of cold with heavy layers + me who brings a lot of warmth, also average at 5 degrees. Value on 5-0 degrees depending on altitude and if we pair

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I recommend because very…

I recommend because it is very practical and easy to transport.

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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.



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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