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* From 25/02/2020 and limited stock
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* From and limited stock
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Our team of trail running enthusiasts designed this vest for carrying your essentials during fast races and your short and middle-distance training sessions. Looking for speed and low weight when trail running? Weighing only 140 g, the 5L vest adapts to your body shape and helps you to perform better while remaining comfortable.

Product benefits

Capacity Carry your essentials thanks to the 5L capacity in the front and rear pockets.
Pockets Enjoy the 2 water bottle pockets at the front, 2 side pockets and 2 back pockets
Lightweight Run without carrying too much weight: the vest weighs only 140 g.
Anatomic design Choose your size between XS/S, M/L and XL (XL only available online).
Stability The vest remains stable thanks to the 3 adjustable straps and height adjustment.
Carrying comfort You'll hardly notice your vest because of its light component and slim fit.
Innovation behind making your product

Technical Information


Measure your waist size at the belly button:
XS/S: 62 cm to 72 cm
M/L: 73 cm to 83 cm
XL: 84 cm to 99 cm

Here is a trail running vest designed to save weight and make you go fast:

For your challenging race objectives and your fast training outings, our team developed a lightweight and effective trail running vest:
- Having a weight of only 140 g when empty and a slim fit, it will give you superior comfort and low weight so that you can perform better.
- Its 6 pockets will carry the mandatory equipment you need (including 1 l of hydration, i.e. two hours of running time on average) without overloading you for uncomplicated short or middle-distance races.

How to manage your hydration with a 5 L pack

This 5 l bag is designed to carry 2 Kalenji 500 ml soft water bottles in the 2 front pockets. What's more, the soft shape means that they can be grabbed more easily or that you can drink from them without taking them out of their pockets.
2 x 500 ml is often the minimum mandatory requirement for short or middle-distance trail running races.
If you want to carry more fluids, take a 500 ml flask water bottle rather than a water bladder in your rear pocket.

How does the low-weight high-performance design work?

The 5 l trail running vest has a fitted cut. This prevents your things from moving about when running.
You have a 110 dB emergency whistle near to your mouth - compulsory for trail running events.
You can unroll the adjustment straps to prevent them from dangling and adjust their height.
The side pockets are big and have rip-tabs for quick access.
The pocket tabs make them easy to open even when you are tired.

How to pack your 5 L bag

To start, put your wind jacket and survival blanket in the rear pocket of the bag.
Then, put the bag on and adjust the height and length of the straps.
In the side pockets, you can store your phone, keys, gels and cereal bars.
Finally, all that remains is to put your flexible water bottles in the shoulder straps and you're ready for your trail run!

Gaëtan, trail running product manager at Kalenji, gives you his advice for choosing the right bag.

"We wanted a simple, lightweight and effective vest. Even the packing process is simple, taking just 2 minutes. It is a great solution for fast races and training sessions: You have immediate access to your wind jacket and supplies. The most important thing is to choose the right size. The closer the vest is to your body, the less it will move about when running. Don't hesitate to try it on in store, even with a load inside. Finally, with 1 L of hydration, you need to think about your supplies."

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Composition / advice

Main fabric
74.00% Polyester, 26.00% Elasthane
Inner fabric
70.00% Polyamide, 30.00% Elasthane
Washing instructions
Machine wash - 30° max - normal
Machine wash - 30° max - normal
Do not bleach
Do not bleach
Do not tumble dry
Do not tumble dry
Do not iron
Do not iron
Do not dry-clean
Do not dry-clean

Our commitments

Test Product At DECATHLON, all our products are tested by a panel of users under the conditions of use for which they were designed. These tests are organised and supervised by a team of engineers dedicated to the task. The product managers, engineers and the entire trail running team use the results of all these tests to develop, create and design technical products that will satisfy our runners.
Guarantee : 2 Years

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