Maintenance and repair of a Forclaz MT900 Trekking bag

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Your MT900 bag is ideal for all your trekking trips and you’ll love its carrying comfort and sturdiness.
We are here to help you if you have a question or a problem with your product.

These instructions apply to all our MT900 Symbium trekking bags.

Some practical advice on using your mt900 backpack

How to adjust your mt900 backpack

The correct adjustment of your backpack is really important so you can walk in the best possible conditions and not hurt your back.

The steps:
1/ Loosen all the straps
2/ Adjust the back according to the different markers proposed
3/ Put the bag on
4/ Put the belt on and tighten it, the weight of the bag is mainly on the hips
5/ Tighten the back straps of the belt and then those of the shoulder straps
6/ Adjust the load restraints and the chest strap

Adjusting a MT900 Trekking bag

What are the straps between the top of the shoulder straps and the top of the back of the bag for?

Load restraints are straps placed at the top of each shoulder strap of your backpack.
Because of the adjustable back height of your bag (thanks to the shoulder straps), it is necessary to adjust the position of the shoulder strap in relation to the bag to limit its swing. This function is provided by these straps.

To adjust them, once the bag is on your back, the belt is buckled and the shoulder strap tension is adjusted, simply grab the strap of each restraint over your shoulder and pull them forward until you feel the bag hug your back.
To control its stability, you can shrug your shoulders a few times and take up tension if necessary.

What are the straps between the top of the shoulder straps and the top of the back of the bag for?
How to properly load your backpack

You will be carrying your backpack for several days. Thus, it is important to organise the loading of the vehicle in such a way as to find a front/back and left/right balance. Your body may tire more easily if the distribution of your bag is unbalanced.

How to properly load your trekking bag
What is the weight limit for your mt900 backpack?

Thanks to the SYMBIUM technology, the MT900 is designed to carry heavy loads of up to 25kg (our test limit).
However, if you are walking for several days and for long periods of time, most mountain professionals recommend that you carry no more than 25% of your own body weight.

What is the symbium technology?

The SYMBIUM concept is a system of articulation of the bag's waistband and the use of shock absorbers on the shoulder straps allowing the backpack to follow the movement of the user's pelvis for better comfort, especially when carrying heavy loads.

How waterproof is my mt900 backpack?

At FORCLAZ, as with most manufacturers, our backpacks use water-repellent but not waterproof components. Indeed, designing a 100% waterproof bag requires the sealing of every seam line as well as the use of specific and very expensive zips. That's why all our bags are equipped with a protective cover to put over your bag in case of rain.

How waterproof is my MT900 backpack?
How can i protect my belongings from dampness?

To each their own style! There are many ways to protect your belongings while trekking, each with its advantages and disadvantages.

Poncho cape:
In terms of external protection for the bag, the poncho is undoubtedly the most effective solution as it allows the user and the bag to be completely covered, without the risk of infiltration at the back. The main problem is the lack of mobility and convenience when it comes to putting your bag down or accessing it.

The rain cover:
Lightweight and quick to install, the rain cover is an outdoor protection. It fits on your backpack in seconds when its case is accessible from the outside (which is the case with our latest bags like the MT500 AIR). In a group, everyone can help their neighbour to put it on without anyone having to put their bag down.
When coloured, they are a practical visibility feature in fog or at night.
The disadvantage of rain covers is that they do not protect the shoulders. In the event of heavy rain, it is not uncommon for water to seep through the back of the bag and it is therefore necessary to protect your most sensitive items in small waterproof bags.
On the other hand, rain covers are susceptible to holes and tears.

Reinforced rain cover:
Like the classic version, this cover protects against rain and has two sides: a classic visible side (orange) and a reinforced dark side to better resist cuts and holes that can be caused by branches. However, they are heavier.

Water-repellent storage cases:
Available in a variety of sizes, the waterproof storage covers allow you to better store your belongings in your bag and protect them from moisture. The only problem is remembering what you put in it or you might have to look for your stuff. Please note that these covers are not completely waterproof. They are therefore not suitable for long exposure to water (do not use outside the bag).

Waterproof storage cases:
More resistant and above all 100% waterproof, these covers are ideal for protecting very sensitive equipment or for protecting items outside the bag. Unfortunately their plastic structure makes them stiffer and heavier.

What warranty covers my backpack?

Decathlon backpacks are designed to be strong and durable and undergo extensive testing (components, seams and finished product) to ensure that they serve you for as long as possible.
We offer a 10-year warranty on all our backpacks from the date on the receipt.

Washing your mt900 backpack

Washing a MT900 trekking bag

Repair your mt900 backpack yourself

For each model, find all compatible spare parts and accessories to carry out the possible repairs.

Men’s mt900 50+10l grey

Consult the technical diagram and find the spare parts for your bag by clicking here.

Maintenance and repair for a MT900 50L Trekking bag
Women’s mt900 50+10l blue

Consult the technical diagram and find the spare parts for your bag by clicking here.

Maintenance and repair for a MT900 50L Trekking bag
Men’s mt900 70+10l grey

Need to repair your backpack? View the technical diagram by clicking here.

Maintenance and repair for a MT900 70L Trekking bag
Women’s mt900 70+10l red

Need to repair your backpack? View the technical diagram by clicking here. 

Maintenance and repair for a MT900 70L Trekking bag
Men’s mt900 90+10l khaki

A buckle to change, a strap to replace... View the technical diagram for your backpack by clicking here.

Maintenance and repair for a MT900 90L Trekking bag


If a small hole has formed on the front or bottom of your bag, you can easily repair it by applying a patch or a piece of adhesive roll (round shape one or two cm larger than the hole). We advise you to apply it on the inside as well as the outside.
If the hole is bigger, go to a cobbler and take advantage of his expertise to give your backpack a second life.

Customise your trekking backpack

Would you like to make your backpack unique by customising it? Visit the workshop in your shop to take advantage of the existing services. Writing, embroidery, stickers... the choice is yours!

Give a second life to your mt900 backpack

Are you not using your backpack anymore and you don't know what to do with it? Instead of throwing it away, don't hesitate to resell it second-hand using the Decathlon Second-hand platform! Fill in all the information about your product online. We will therefore offer you the best sales solutions, then you can drop off your product in the store to finalize the procedure.