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Forclaz Men's MT900 50+10 L Ultralight Backpacking Pack

Sale price: $189.00 Regular price:

Thanks to the design choices, FORCLAZ reduced the weight of this bag to just 2.9 lbs without compromising on durability. The bag can be tailored to your needs thanks to the multi-purpose straps.

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Sale price: $189.00 Regular price:

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About this item:

  • This backpack is made for multiple days hiking or trekking in autonomy. You can carry everything you need to camp, drink and eat on your back with comfort.
  • The MT900 ULTRALIGHT only weighs 2.9 lb and can contain a total volume of 50 liters which we recommend for a trip under 2 weeks long. The top of the bag is adjustable and can hold an extra 10 liters of volume.
  • This backpack has plenty of features if you are looking for a lightweight technical option at a great price: AIR concept back ventilation, rain cover, water bottle holder, hiking poles holder, 7 pockets and a compartment for a water bladder for easy hydration.
  • The AIR concept: in order for your back to dry faster, we added a mesh on top of a ventilated structure. Ideal for long and sweaty day hikes from one camp to another !
  • This is a men's backpack: This bag has been conceived for a masculine morphology (torso and hips). We recommend to stick to your gender when you choose a bag for comfort purposes when carrying it on your back.
  • 10-year warranty: the fabric of the bag is ultra resistant and Decathlon is proud to offer this warranty for any defect that could appear in the next 10 years.
Model: 8642599

Product Videos

Product Features

Forclaz Men's MT900 50+10 L Ultralight Backpacking Pack | FORCLAZ designed this ultralight & robust bag for demanding users looking for performanceIdeal for completing 2 stages of a long-distance hiking trail in 1 day.

Thanks to the design choices, FORCLAZ reduced the weight of this bag to just 2.9 lbs without compromising on durability. The bag can be tailored to your needs thanks to the multi-purpose straps.

A photo of the Forclaz Men's MT900 50+10 L Ultralight Backpacking Pack in use
A photo of the Forclaz Men's MT900 50+10 L Ultralight Backpacking Pack in use

Carrying comfort

Carrying up to 12kg, suitable for men. Ventilated back, adjustable height

Multiple compartments

Full height access to the central section, 7pockets (cent.sect:3, lid:2, belt:2


Pole holder, rain cover, side pockets which can be accessed when walking

Abrasion resistant

Main fabric in 100D RS polyamide, reinforced bag bottom (210D RS)


Reinforced frame with mesh reducing pressure and letting the back breathe.

Easy hydration

Internal compartment for a water bladder (not included)


1.3 kg. The empty weight indicated is that of our benchmark sample

Questions & Answers

Look for product information, frequently asked questions, opinions...


Does it come in orange? Weight capacity?


This backpack has only one color option. We do not provide a weight capacity promise, however we offer a 10-year warranty: the fabric of the bag is ultra resistant and Decathlon is proud to offer this warranty for any defect that could appear in the next 10 years.

By Uluç on Oct 30, 2023 | STAFF

Product Customer Reviews

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Great, relatively light, comfortable

This is the perfect comfort to weight ratio backpack I've ever tried. The new class of ultralight backpacks are just not very comfortable. I do wish they had a 40l or 50l option.

Need a larger size

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With this backpack I followed Francesco's path crossing the Apennines between Tuscany and Umbria... super satisfied. It met all my needs, in some cases I loaded it well over 14 kg without any problems.



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ultralight backpack

Modern, very practical products

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Light backpack

Very comfortable if the load limit is respected, a little worse if it is overloaded.

Ultralight trekking backpack

Effective product which fulfills its storage functions with its multiple pockets as well as its central opening which allows direct access to the bottom of the bag which is rather practical when hiking in order to take out and store your belongings. With more storage space in the pocket, it would have been perfect! Strong point: lightweight bag

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Value for money to be reviewed…

Value for money to be reviewed...

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Tested on the GR…

Tested on the GR 20, this bag is very light, very pleasant to carry and is quite durable. The only downside is that the side pockets do not close (which surely contributes to the lightness of the bag)

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OK OVERALL, good product

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Decathlon's best in-house backpack

A really decent backpack that can withstand comparison with renowned competition. For me, the design of the back is a bit of a disadvantage - the mesh and the worse possibility of packing the backpack to the optimal center of gravity - but this is a characteristic feature that is not completely satisfactory for me even with other brands of backpacks. Small fault with the surface of the shoulder straps - it is not very pleasant and it scratches a lot on the bare body - completely useless on a sweatshirt or jacket. The only major complaint is directed at the length of the loincloth - it is terribly long and the effort to be universal is detrimental (and limiting) here - it cannot be tightened well. Overall, the backpack exceeded my expectations, packability, carrying comfort; the front zipper works better than expected. The other things I would criticize are obvious at first glance and there is no backpack that will please everyone :-) . I can recommend it to everyone who is looking for a decent all-purpose backpack in this size in a price/performance ratio, with a reasonable weight.

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Lightweight but robust multifunctional comfortable trekking backpack

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My first real lightweight backpack!

This is my first real hiking backpack! I load it between 7 and 8.5kg without water. Pros: Nice. Light. Large capacity. Easy and convenient adjustable carrying height. Well-designed frame, effective anti-perspiration net. (We will always sweat but the air circulates). Efficient and wide ventral tightening, good support but it lacks padding and therefore comfort on long outings! Convenient belt pockets. Modular, possibility of gaining 100gr by removing the upper pocket, that's what I did. The -: All the straps are way too long, I shortened them. Despite several different settings, in just two days of hiking the main carrying straps end up irritating me around the collarbones, I'm rather thin and bony but this is very unpleasant when carrying! This happens on every one of my mountain hikes. Is this the price to pay for having a light bag??? These straps should have much better padding even if it means taking on a little weight!!! The side pockets are not practical, I'm fine with them but it's easy to lose what's inside, their lacing system is not reliable and not practical... The bag does not fit straight once placed on the ground... In my opinion, the load should not exceed 10kg, including the bag, otherwise you will experience great discomfort! So I made the choice to carry my 1.5l of water in a banana bag so as not to weigh down the bag. I do not know if I will recommend the purchase of this bag, despite its many faults it suits me but there must be much better among the competition! Definitely more expensive too...

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extremely fragile side pocket

After 3 days of hiking, a side pocket was no longer usable. The rope came out, and I was unable to find a possible repair
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Additional Product Information


Main fabric: 100.0% Polyamide ; Lining: 100.0% Polyamide ; Yoke: 100.0% Polyamide ; Webbing: 100.0% Polypropylene ; Bag cover: 100.0% Polyester ; Coating: 100.0% Polyurethane


Bag dimensions when in use: Height : 65 cm / 26 in Width: 35cm / 14 inDepth: 35 Cm/14 inTorso length (= distance 7th vertebrate - ilium): Minimum: 39 Cm/15 in Maximum: 51 Cm/20 in The waistband:Minimum: 74 Cm/29 in Maximum: 144 cm / 57 in


1.3 kg All inclusive. Weight of the removable rain cover 100g.Weight of the removable lid 100g.i.e. 1.1 kg in simple mode!

Air design

Inspired by its sister, the MT500 AIR, this bag replicates many of the features of its ventilated back structure with a mesh fabric so that the back can breathe more and dry quickly.


50 L volume +10 L extension. The volume of each backpack is measured using a standardised method. we use small balls to fill the main compartment as well as each pocket. The balls are then emptied into a graduated container in order to determine the equivalent volume in litres, with a margin of error of just a few %.

How to pack a backpack?

Put your bedding at the bottom. Put heavy gear (tent, camp stove, food) near your back. Store your clothing around it. A groundsheet or tent can be placed under the flap or under the bag if there isn't room inside. Keep your waterproof jacket and fleece to hand. Place small items for daily use (sun cream, map, glasses etc.) in the pockets. The water bladder can be placed in the compartment provided down the back.

How to use the multi-use straps?

The new MT500 AIR and MT900 UL series of trekking backpacks have two straps with open aluminium buckles (on the lower part of the bag). These straps let you hook on a tent or mattress under the bag or on the barrel. If not in use, these straps can be stored (by pushing them inside) in the hidden pocket intended for this or detached and used elsewhere with the lark's head knot buckle.

Complementary accessories

To make your MT900 UL bag easier to use, check out our storage accessories, repair buckles or hanging straps on our website.

Recommended carry weight

According to the project for which this backpack was designed, we recommend you don’t load it above 12 kg. Then you can benefit from all its features. Moreover, it’s not recommended to carry a load greater than 20-25% of your own weight and put too much pressure on your back.


Main fabric in 100D RS polyamide (ripstop = additional resistance to tearing), reinforced bag bottom (210D RS)

Product testing

All our backpacks are field-tested by users who represent the target market in conditions identical to those found in typical use. In particular, our Test Missions bring together the product manager with people who are not affiliated with DECATHLON to test, improve and validate the products. This particular model was tested over a five-week period by trekkers in the Canaries, Pyrenees and the Mont-Blanc mountain range.

Storage instructions

Store your bag in a dry, ventilated place away from direct light.



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