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Designed by our team of enthusiasts, this 15 L bag provides you with an efficient way to carry all the mandatory gear on ultra trail runs from 80 to 300 km. How do you like the idea of a bag tested at the Western StateⓇ, the Tor des GéantsⓇ and the TempliersⓇ? It's specially designed for ultra trail, with 15 pockets to store all your mandatory gear.

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

15 litres and 15 pockets, to keep everything within easy reach while trail running.

There are 8 pockets at the front so you can reach your essentials in a single move:
- Pockets for 2 soft 500 mL flasks
- Waterproof zipped pocket for your smartphone
- Velcro pocket for your gels and bars
- Mesh pocket for your rubbish
It also features 7 pockets at the back to store all your mandatory gear: your documents in a protected pocket, 1 survival blanket... And a mesh pocket to keep your rain jacket to hand at all times.

A bag designed to keep you hydrated on trail runs

With space for a 2-litre water bladder at the back (included, attached by hooking on) and 2 front pockets for 500-mL flasks, this bag allows you to carry up to 3 litres of water in total.
Considering that you drink an average of 500 mL of water per hour while trail running, that gives you 6 hours of autonomy. Enough to give you peace of mind between aid stations, even in ultra trail!

So, what about the water bladder?

Your bag comes with a 2-litre water bladder included, 38 x 18 cm in size. It's suitable for temperatures ranging between -20 and +40°C, for water: no milk, no alcohol, and no putting it in the microwave ;)
The tube is 100 cm long and you can cut it to whatever length you want!

A bag so light you don't even notice it

Available in 3 sizes (XS/S, M/L, XL) and easy to adjust:
- you can adjust the height of the 3 front straps
- the 2 straps on the side pockets adjust the tightness of the bag
Result: Your bag stays so stable you'll forget you've even got it on while trail running.

A design loaded with details, to make your life easy

Your tube is held in pace by a magnetic attachment: it goes back in its place automatically when you let it go
- The kangaroo pocket at the back lets you access your rain jacket in one move
- Your smartphone is within easy reach, in a waterproof zipped pocket at the front
- The 110 dB safety whistle is incorporated inside a front pocket

Never run without your poles?

Along with the whistle - mandatory in many races - which is located in the little chest pocket (hence near your mouth!), this bag also features 2 elastic straps on each side to attach your 3-section trail running poles.

Gaëtan, Kalenji product manager, tells the story behind the 15 L ultra trail bag:

We wanted a bag that'll take you to the end of your trails in complete safety and that can carry all your mandatory gear. We took our customers' opinions into account, for instance adding the smartphone pocket.
We designed it for ultra trail, the most demanding category there is. Then we did two series of protocolled tests, which yielded excellent results.
We're proud of this product, we spent a lot of time working on its stability, compartmentalization and accessibility.

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Composition / advice

Main fabric
100.00% Polyester (PES)
Main lining
74.00% Polyester (PES), 26.00% Elasthane
78.00% Polyamide, 22.00% Elasthane
15.00% Polyurethane (PU), 85.00% Polyester (PES)
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
Legal notice Water bladder: Complies with applicable food contact standards and does not contain Bisphenol A (BPA).

Our commitments

Our Kalenji trail ambassadors, Eric at the Western StateⓇ 2018, Cyrille at the Tor des GéantsⓇ 2018. And many other testers on trail runs throughout the world.
Test Product At Kalenji trail running, our products are tested by a panel of users under the real-life conditions they were designed for. These tests are organised by a team of technicians dedicated to this task. The Kalenji 15 L ultra trail running bag was given a score of 9/10 by our independent testers
Guarantee : 2 Years

Product benefits

Capacity Carry everything you need: 15 L of storage in the front and back pockets.
Pockets Keep your gear within easy reach: 8 pockets in the front and 7 in the back.
Lightweight For longer and lighter trails, your bag weighs only 360 grams.
Anatomic design A bag suited to your needs: choose between sizes XS/S, M/L and XL
Stability A bag that stays in place: 2 side straps and 3 adjustable chest straps.
Ease of use Easily store gels, bars, smartphone and 2 flasks in the front pockets.
Easy hydration Stay hydrated: 2 L water bladder included, storage for 2 soft 500 mL flasks

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