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Men's Trekking Backpack 70+10 L - MT900 SYMBIUM

£119.99 −16%

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

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

Color: Carbon grey


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Eco designed

Learn more about Eco-Designed Products.

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Product benefits

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)


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


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

Easy hydration

Internal compartment for a water bladder (not included)


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


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

Technical information


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

SYMBIUM technology

The comfort of a backpack lies in its good balance when walking. Symbium technology consists of a jointed waistband that allows the backpack to adapt to the trekker's movements when walking.
No more balancing effects that tire out the trekker thanks to the SYMBIUM system.


Extendable volume: 70 L + 10 L extension thanks to the bag’s top flap with adjustable height. 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 %.

Dying process

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

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.

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

The grey colour is neutral so uses less dye. We also use a “bi-ton” dyeing process where only one thread in every two is dyed. This dyed yarn is also made from a bulk dyeing process which incorporates the colour pigments from the yarn manufacturing phase onwards.Forclaz is committed to improving the environmental impact of its products through these actions.

Complementary accessories

Compatible with 2x15L 1/2 moon storage bags.
It's important that you are well equipped for your trek to take place in the best conditions. So to complete your equipment and make your MT900 backpack easy to use, check out our storage accessories


10 years

Product concept & technology

Product Composition

Main fabric 100% Polyester Lining 100% Polyester Yoke 100% Polyamide Webbing 100% Polypropylene Bag cover 100% Polyester Coating 100% Polyurethane Foam 100% Ethylene Vinyl Acetate


Store your bag in a dry and ventilated place, out of the sun.

User Directions

Do not put the bag in a washing machine.


All our backpacks undergo field tests by users who are representative of our target market under similar conditions to those you will encounter. To test, assess and validate products, our mission test connects the product manager responsible for the product design with individuals independent to DECATHLON. This backpack was tested by trekkers for 5 weeks in the Canary Islands, the Pyrenees and the Mont Blanc mountain range.

Approved By

Our DECATHLON in-store mountain instructors: English, Spanish, Indian, French, German, Dutch, all participated in this product’s design throughout its development process.
Discover trekking, hire equipment and check out our products and tips at

Maintenance advice

Hand wash

Do not bleach

Do not tumble dry

Do not iron

Do not dry-clean


Men's Trekking Backpack 70+10 L - MT900 SYMBIUM
Men's Trekking Backpack 70+10 L - MT900 SYMBIUM
Men's Trekking Backpack 70+10 L - MT900 SYMBIUM


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