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Mountain Bike Hydration Backpack ST 500 4L/1L Water - Black

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Sale price: Dhs. 145.00

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This hydration backpack is designed to keep you easily hydrated when mountain bike touring for less than 2 hours.

The backpack is compact and light, yet comes with four litres of space and three large pockets, ensuring you can take what you need for long rides. Sold with a one-litre pack for your water.

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Sale price: Dhs. 145.00

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Product Features

A photo of the Mountain Bike Hydration Backpack ST 500 4L/1L Water - Black in use


A usable volume of 4L and a 1L water bladder: Stay hydrated for 2 hours

Multiple compartments

1 large compartment divided in 2 for the water bladder. 2 side zip pockets


The straps are adjustable with their parachute-style bindings.

Carrying comfort

Back made of perforated foam & straps made with mesh for ventilation.


Light-compatible insert (VIOO Clip) on the back of the bag

Ease of use

Zips open using the attached cords for easy opening even with gloves:3 pockets.

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Product Reviews

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2747 reviews

Mountain Bike Hydration Backpack ST 500 4L/1L Water - Black
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Good little bag

Good product just wish it had a 2l bladder as the other bag which was 2 litre was to big

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Convenient backpack for longer bike rides

Love the light small size. Completed a 6 hour bike ride and didn’t even notice I was wearing this. It has enough room for the essentials - 2 spare inner tubes, tools, small snack bars and the water bag with enough room for a phone/wallet/car keys.

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Great value

Purchased this on the spur of the moment. Well pleased, little pockets to hold small items of equipment. Fits snuggley and is comfortable. Easy to get a drink from whilst cycling. Great value for the price, under £20.

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Great pack

As with most Decathlon stuff simple well thought out design. No little ports to fill through, the entire top of the bladder is open. Draining and cleaning is easy.

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Great backpack and good value

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Great Little Bag

Ordered this bag for a mtb trip as I usually don't ride with a backpack. This is such a great little bag, along with the bladder it's great value for money and more than does the job. Looks very smart!

MTB hydration back pack st500 2L

Very good for long rides plenty of pocket space

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Its good, but the old the design a few years ago was better with the outer netting, which I use it to store flat shoes and an extra waterbottle for when I go skating. Still have the old one, but needed a spare. This will do though. The older design had a plastic clip at the front, this one is velcro which sometimes catches onto my sports top.

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Perfect for performance

I bought this for mountain biking but have since used it for running. Using it is simple decent space for extra bits but not a large items. The pouch is easy to clean and doesn’t stain even when putting berry juice in it.

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Good for kids

Not a big fan of the Velcro fastening chest strap myself but my daughter loves it and anything that encourages her to get out on the bike more I think is a great thing.

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Took this out today for a ten mile run and it was great. Lightweight, holds secure and doesn't move around when running and lots of pockets to put phones, keys, energy pouches in etc. To those saying the water flow isnt that great, you need to bite the plastic slightly to increase water flow. Great little product. Would definitely recommend!

Does as it says

Lovely little pack plenty if water for my needs well made fab item would recomend

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Rockrider 500 Hydration backpack

Bought this as it is lightweight, secondly.. you can easily remove water pouch and use back as mini day bag when doing long sportifs on bike for gels/food/riding water proofs etc...

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Nice bit of kit

Great little bit of kit. Easy to fill and wash out. Use it for running & cycling.

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accurate description

perfect for a young female cyclist.

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Additional Product informations



  • 16% Polyurethane
  • 84% Polyethylene Terephtalate

Main fabric

  • 15% Polyurethane
  • 85% Polyamide 6

1 litre of water and 4l of pocket space to keep everything in reach as you ride!

A large central compartment divided into 2:1- to store an inner tube, a mini pump, a windproof jacket, etc.2 - for the 1L water bladder with a hook to hold it in place.A second pocket on the front of the bag with 3 separators for tissues, tyre lever, multitool, cereal bars, and a net pocket for papers/keys.And a third zip pocket for a mobile phone; easy access for photos.

A water bladder to stay hydrated!

This bag is supplied with a 1 litre water bladder. Suitable for temperatures between -20 and +40°C, for water: no milk, no alcohol, and not suitable for microwaves :)Cut the tube to your preferred length!After each outing, rinse and dry the water bladder.To make it easier, use the cleaning kit with the bottle brush and a drying hanger (code: 5935596).

A light and compact bag:

The format of this hydration backpack is specially designed for short MTB rides of around 2 hours with 1 litre of water.4-litre volume for pockets: Ideal for carrying everything you need without overloading your back!

Comfort and breathability:

We've chosen fabrics that are comfortable to carry on your mountain biking rides.- Foam on the back and straps.- Highly breathable mesh fabric to wick perspiration from the back and straps.

Ease of use:

Fill your water bladder, insert it and secure it using the hook, it's very easy!Side straps to allow you to adjust the fit of your bag.The result? Your bag stays stable and allows you to forget about it as you ride.

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.

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