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Men's mountain trekking rucksack | TREK 900 Symbium 70+10L

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Sale price: LBP664,000.00

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We developed this sturdy and generously sized 70L bag (+ 10L extendable) for men travelling autonomously in the mountains for several days

Backpack that is durable and lightweight with a carry system that is comfortable for long expedition-type treks lasting several weeks. SYMBIUM concept: The most comfortable in the range

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Sale price: LBP664,000.00

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Product Features

A photo of the Men's mountain trekking rucksack | TREK 900 Symbium 70+10L in use

Carrying comfort

Adjustable back and shoulder straps.

Multiple compartments

Wide front access. 10 pockets + water bladder.


2 water bottle holders, pole holder rain coverTent holder (straps under the bag)


2.7kg.The weight indicated is that of our benchmark sample.


Durable 600 denier polyester fabric. Polyamide-reinforced bag bottom.


Back with aluminium bars to reduce pressure and allow the back to breathe.

Easy hydration

Back with aluminium bars to reduce pressure and allow the back to breathe.


We dye the yarn with coloured granules to avoid using dye baths

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Product Reviews

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352 reviews

Men's mountain trekking rucksack | TREK 900 Symbium 70+10L
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Great design

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We bought this backpack a couple of years ago for our son (180cm) for DoE and worked well. This month our daughter had a school trip to an adventure place. She is only 160cm height, and this is a backpack for men but thanks to the good adjustment system, we moved the straps into XS and it worked! She was almost invisible from back but she could comfortably walk. There are endless pockets and straps, good opening system for the main compartment, removable top which becomes a bag, we are vary happy with this backpack, I am impressed with Dacathlon. Thank you!

Low quality

Zipper broken after few weeks

Perfect back pack. Ill explain some missing detail

Bought this to replace a cheap '65 + 5L' backpack from Amazon. Always knew it was not 70L. Bought this (70+10) over the 90+10 thank god I did, its a big old backpack. but This is the perfect backpack, it literally has all the bells and whistles. Yet to test out and about but I have fully loaded it so I will explain below. In the top you have your pouch for rain cover, theres room in there for your rain jacket also, on the underside of the lid there is another zip pocket, so first aid kit, headlamp etc in there. Also in there is a zipped mesh pouch for phone wallet and a clip for keys. The 2 water bottle holders is perfect without removing other handy features such as 2 pockets on waist belt. Waist belt is thick and sturdy and does not dig in. Plenty of adjustment for shoulder width, height, waist and chest. Main compartment is absolutely huge. With everything I need in there for a hike in comfort which doesnt fit in most medium sized bags there is plenty of room upwards If I needed it. So main compartment has large synthetic sleeping bag, tent, clothes, poles and pegs, food sack, frying pan, sleeping mat, hydration bladder and stove set. jacket, waterproof trousers. Tarp, rope, fold out chair. Main side pockets quick access stuff like toiletries, spade, snacks, light, multitool etc Then still 2 mesh pockets with straps spare for light camp trainers or extra poles, and also trekking pole holders to the side. Foam sleeping mat underneath the bag. Few things hanging off the front tabs. All this comes in at around 12KG and when i set it up on my back correctly I literally did not feel any heavier. Was abit dubious about a framed backpack for the extra weight but it is true, when something fits properly you can definitely carry more. Really looking forward to taking this out. Cannot recommend enough for (initial) comfort and storage and how well thought out it is. If anything changes when I can take it out I will be sure to update



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Good bag, but The paddling in The belt are really cheap and poor. Thinking about return The bag beacause of The paddling, so bad.

Best Bag I've Bought

Extremely comfortable with lots of options to spread loading when carrying heavy. Ability to adjust the height of the shoulder straps is great as I'm quite tall. straps on the bottom are a good addition to carry a tent or something large on the outside of the bag, with the waterproof cover able to cover this aswell. Space inside is huge with a great amount of extra pockets and the zip to open the front makes everything in your bag accessible without having to drag the whole lot out of the top. Pockets for waterbottle being tilted is a great ergonomic feature, making it easy to access.

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Unbelievable value

Really well designed with so many features for the cheap price.

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good value

Works well and can take a lot of stuff

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Great back pack for hiking

Good materials quality design Not a single loose stitch

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Hiking / trekking pack

9 massive pockets so lots of room for everything. adjustable everything like every strap etc. Hydration capable. Pack cover included good for three days plus in the wilderness.

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so much space! great versatility! Wow!

Bought this for a multiday tramp in the mountains overseas followed by tour around some towns. As a tall woman、 I found no problems carrying this around and it gave me bonus room compared to the women's model. The adjustment straps、 especially the belt ones were thoughtfully layed out and easy to tighten and loosen. A great feature is the detachable top that can be converted into a shoulder bag if you want to dump the rest of your gear at camp or in a hotel and explore carrying valuables etc only (in mine i fit a dslr、 a kindle、 a book and a nintendo). The interior pouch is perfect for camelback hydration bladder. The side pockets are brilliant and tough and there are smaller pockets on the waist belt! I was able to carry camping equipment、sleeping bag some clothes and had space to fit in sizable souvineers too!

Great bag!

Great bag!

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Hello Brad,

Thank you very much for leaving a review about this bag!

Really happy to hear that you are enjoying it.

Have a great day and see you again very soon.

Decathlon Calgary Team

Spacious and light weight

Very spacious and light weight which is good for camping

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70 10 mt 900


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Additional Product informations


Main fabric

  • 100% Polyester


  • 100% Polyester


  • 100% Polyamide


  • 100% Polypropylene

Bag cover

  • 100% Polyester


  • 100% Polyurethane


  • 100% Polyurethane

Height: 77cm,Width: 48cm,Depth: 38 cm

Symbium technology

In order to be comfortable, a backpack must also be well-balanced while you walk. Symbium technology consists of a jointed waistband that allows the backpack to adapt to the trekker's movements when walking.Thanks to the symbium system you can say goodbye to the swinging effect that tire out trekkers.


Extendable volume:70L + 10 litres extra thanks to the adjustable height of the bag top.The volume of each backpack is measured using a standard 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 %

Dying process

Textile dyeing requires a lot of water but also produces waste water from the dye baths.To reduce the environmental impact, we have opted for mass pigmentation (also called Dope Dye), integrating the colour pigments from initial thread manufacture.This process reduces the CO2 emissions of this backpack by 30% compared to the old model.

How to pack a backpack?

Put your bedding at the bottom. Put heavy gear (tent, camp stove, food) near your back. Pack your clothes around these items. Your sleeping mat can be placed under the flap and the tent under the bag if there is no room inside.Keep a rainproof jacket and fleece close at hand. In the pockets, place small items for the day (sunscreen, map, glasses...). If carrying a hydration pack (water bladder), this should be placed in its special pocket along the back.

Why are our rain covers grey when some trekkers want them to be brightly coloured?

The grey colour used for the covers of our trekking rucksacks is neutral because it consumes less dye.The component is made of BITON: this process allows us to lower our CO2 impact and reduce consumption and water pollution in comparison to coloured models.These small measures demonstrate the commitment of Forclaz to improve the environmental impact of its products.

Complementary accessories

Compatible with 2x15L 1/2 moon storage bags.Check out our storage accessories that facilitate the use of the TREK 900 bag here:

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