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Forclaz MT500 50°F Polyester Sleeping Bag

Sale price: $40.00 Regular price: $59.99

This very compact and lightweight mummy bag is perfect for summer use. You'll love its 2 side zips with a double slider for optimal ventilation. Can be twinned.

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Sale price: $40.00 Regular price: $59.99

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San Francisco, 735 Market St. Options

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About this item:

  • Comfort Temperature: 50°F (10°C) I Temperature Limit: 41°F (5°C) I Synthetic padding
  • Size L Weight: 2 lbs (970 g) I Volume: 7.9 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: 8618866

Product Features

A photo of the Forclaz MT500 50°F Polyester Sleeping Bag in use
A photo of the Forclaz MT500 50°F Polyester Sleeping Bag in use

Forclaz MT500 50°F Polyester Sleeping Bag | Our designers, who are all trekking enthusiasts, designed this sleeping bag to sleep comfortably at temperatures of 10C or above.

This very compact and lightweight mummy bag is perfect for summer use. You'll love its 2 side zips with a double slider for optimal ventilation. Can be twinned.

Optimal temperature

Comfort temperature 10°C, limit temperature 5°C. Synthetic padding

Easy to transport

For size L. Weight: 970g. Volume: 7.9 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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Excellent product

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Comfortable, not noisy, and being able to attach it with other duvets from the same range to make a giant duvet is a great idea!!

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Compact in size

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It is a nice bag. I used it recently while travelling on the train and at the campsite at Kutch, Gujrat. The weight is just about a kilogram, and once packed, it takes very little space. Of course, it is not very comfortable when the weather is a bit on the warmer side.

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a good, compact product

1st test 15 days ago. Good practical product Missing a pocket for the smartphone like what I had on an old sleeping bag

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keep warm

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The product I was looking for, explained in detail and recommended by the staff

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Small storage volume, warm and warm

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This price is very good

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sleeping bag

I loved this bag. Very useful

Lightweight and easy to carry

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Very spacious and therefore comfortable bag.


To be used in summer only, the zippers are quite practical.

Warm and practical

Warm and practical

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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.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: 790 g, user up to 1.59m tall. Bag dimensions: L 33 cm Ø 15.5 cm. Volume 6.2 L.Size M: 890 g, user from 1.60 to 1.69m tall. Bag dim.: L 33 cm Ø 16.5 cm. Volume 7.1 L.Size L: 970 g, user from 1.70m to 1.84m tall. Bag dim.: L 33 cm Ø 17.5 cm. Volume 7.9 L.Size XL: 1040 g, user from 1.85m to 2m tall. Bag dim.: L 33 cm Ø 18.5 cm. Volume 8.9 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 overlapping layers of 100% polyester wadding (90% recycled) 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 ”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.



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

Superior quality. Unbeatable prices.

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