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Rockrider Mountain Bike Hydration Backpack ST 900 12L 2L Water - Black

Regular price: $99.99 Regular price:

The 12 litre capacity is well-distributed for bringing what you need. Enjoy the mesh at the back and various adjustments.

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Sale price: $99.99 Regular price:

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San Francisco, 735 Market St. Options

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About this item:

  • Capacity: 6 L bag with a 2 L bladder for hydration
  • Multiple compartments: Many compartments for tool and item storage
  • Stability: Adjustable straps
  • Carrying comfort: Mesh straps and foam padding for excellent comfort
  • Use: For hiking, camping, and other outdoor activities
Model: 8300158

Product Features

Rockrider Mountain Bike Hydration Backpack ST 900 12L 2L Water - Black | This hydration backpack is designed to keep you easily hydrated when mountain bike touring for less than 4 hours.

The 12 litre capacity is well-distributed for bringing what you need. Enjoy the mesh at the back and various adjustments.

A photo of the Rockrider Mountain Bike Hydration Backpack ST 900 12L 2L Water - Black in use
A photo of the Rockrider Mountain Bike Hydration Backpack ST 900 12L 2L Water - Black in use


A usable volume of 12L and a 2L water bladder: drinking for up to 4 hours.

Multiple compartments

1 large compartment, 1 tool pocket, 2 side pockets, 1 helmet gusset, etc.


Adjusts with the shoulder straps, the waist strap, and the chest strap.

Carrying comfort

There are 3D mesh pads at the back and hips for ventilation.


The bag comes with a built-in protective rain and mud cover.


VIOO CLIP light attachment point on the back

Questions & Answers

Product Customer Reviews

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Great bike backpack

The backpack accompanies me on every bike tour. It has space for the essentials. The hydration bladder is great.

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Sturdy and enough space

Purchased this for longer cycling trips, but this has already been changed to daily use. Very spacious for a bicycle bag and yet you don't feel that you are wearing it while cycling. I not only take my cycling gear with me, but extra clothing and even running shoes. I can not live without!

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Truly an excellent purchase

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Very good backpack…

Very good water bag for the bike with lots of storage, however the location to put the helmet on mine fits poorly in the location provided for

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Practical. The bag…

Practical. The backpack is for my husband.

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very good MTB bag too bad!

very good mtb bag, too bad the puff for the helmet does not have a zipper it would have added an extra compartment which would have prevented detaching the two aluminum tabs to reach the largest pocket, otherwise very functional!

practical well designed versatile…

practical well designed versatile I use it for cycling work just maybe a little heavy but very solid

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The backpack is ergonomically well made in my opinion. It sits on my back and the padding makes me sweat less.

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Very functional. By closing the…

Very functional. By closing the belt you don't feel the weight of the bag.

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The best backpack up to PLN 250

Nothing more, nothing less, lots of space, water bladder, top quality workmanship, I recommend it

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Comfortable and optimal size

The straps and back panel are comfortable and seem pretty good for sweat. The number and shape of the compartments are well designed. Its size is quite optimal if you basically want a small backpack for a few everyday things, but sometimes you would also like to carry something medium-sized. They add a rain cover. The water bag works well, but it makes sense to buy the separate protective cap for it, even if it is not cheap.

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Backpack with water bag which is really comfortable and spacious for a small 12 litre, it allows you to always have everything you need at hand during a mountain bike excursion, the 2 liter bag is enough for even long journeys and in any case it is very easy to fill. I find it very comfortable on the back even when fully loaded, the very padded and perforated backrest doesn't make your back sweat too much and above all it becomes a 'second skin' once properly adjusted, it doesn't hinder movements in any way even on the most demanding trails and above all it remains still. I bought it for mountain biking but it has now become my trusted adventure companion also for trekking (if you don't want to be out and about at night, otherwise it stays at home and the beast comes with me) and cross-country skiing . I highly recommend it

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This purchase was…

This purchase was made as a gift. It totally meets expectations

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Very practical bag

Very practical bag

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Additional Product Information


Bag: 50.0% Polyester, 50.0% Polyamide ; Water pouch: 100.0% Thermoplastic Polyurethane

Maintenance tips:

For hygiene reasons, we recommend cleaning your water bladder after each use. To help you clean out the tube, you can order a special brush using product ref. 5935596. This kit comes with a hanger to make it easier to dry out the inside of the bladder.Tip: If you don't want your drink to taste like plastic, wash the bladder, dry it well, and place it in your freezer. Take it out a few hours before your ride. This will stop any flavour transfer.

Bring with you...

This hydration pack comes with a 2 L water bladder. But also remember to bring:- your food (granola bars, energy gels, etc.)- your multi-function adjustment tool (ref: 8386669)- a puncture repair kit (inner tube, tyre lever, hand pump, puncture repair spray, CO² cartridge, etc.)- your chain rivet extractor and a quick link - a piece of identification, blood type card- a means of payment and a telephone- a 1st aid kit- etc...

A large water bladder

With its 2-litre capacity, your water bladder will last you around 3 hours of riding. Its wide opening makes it quick to fill up. When closing it, make sure the slider clips into place to ensure it won't leak.

Great water flow

Before you set off, remember to remove the air to improve water flow. Just turn the hydration bladder upside down once filled, direct the air bubbles towards the tube opening and suck them out. The bite valve is lockable (rotates 180°) to prevent leaks when not in use. It won't drip, even when in the open position. To get a good flow when drinking, pinch the valve with your mouth and suck.

Care tips

To make your bag last longer, we recommend waterproofing it before you first use it. Even though the fabric is already water-repellent, extra waterproofing will stop mud getting caked onto it. Before each ride, remember to wash and dry your water bladder with the help of the cleaning kit (product ref. 5935596).If you don't want to get a plasticky taste, put your dry water bladder in your freezer. This will stop any flavour transfer.

Extending the product's lifespan

Remember to take a look at our water bladders support page to help your product last longer.

Product testing

At Decathlon, all of our products are tested by a panel of users in the conditions for which the products were designed. These tests are led and monitored by our design team. All of these tests allow our product managers, engineers and the whole mountain biking team to develop, create and design technical products that guarantee customer satisfaction.

Storage instructions

Once clean and dry, keep your backpack and water bladder in a dry place and away from direct sources of heat. Clean by hand in soapy water.




Size Guide Visual

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