instinct trail running available from Fast and Light



PX: the lightest, most minimalist non-compressive & no bounce option for carrying your essentials whilst on a run.

Road & trail, for 1 hour, 20km or your next marathon.
Precursor of an all new category; neither pack nor belt.

Drop your belt. Sling on the PX!

  • Volume: 3.1L
  • Weight: 160g
  • Size: One Size

In stock (can be backordered)


The simple, lightweight & minimalist option for carrying your essentials.

  • Non-compressive & no bounce.
  • Wonderfully simple, PX discretely carries all your essentials.
  • Like a second skin, it’s designed to go unnoticed!

High sitting, the PX allows immediate & easy access to hydration, feed, poles & adjustments.

Adjustable front sternum straps and our unique elastic side lacing system allow for a custom fit to almost any body type.
Discover stability, absolute freedom of movement, immediate access to storage and unconstrained breathing.

Optimal positioning of pockets & adjustments for natural, effortless & intuitive access.
Lightweight & breathable honeycomb mesh ensures ventilation and sweat dissipation without sacrificing strength or reliability.

PX easily carries :

  • 2 x 500ml of hydration
  • Feed
  • Rain jacket
  • Safety Kit
  • Phone
  • Headlamp
  • Poles


  • 2x 500ml hydration pockets + elastic compression cords with auto lock. Sits high for immediate and effortless access.
  • 2x 500ml feed storage pockets: extra large storage & easy access.
  • 1x 100ml shoulder pocket, non-stretch internal cord ring + whistle. For your safety essentials and more …
  • Front vertical pole attachment (both left and right side).


  • 1x 500ml horizontal pocket with elastic compression cord and auto lock + velcro locking system. Easily access your rain gear right from the first drop without removing bag!
  • 1x 300ml bottom horizontal pocket with snap button closure gives central access to your safety kit, headlamp(s), gloves, arm warmers…


  • 1 front pole attachment solution. Front: vertically right & left


  • 2 adjustable chest straps mounted on 20cm sliders = custom fit vertically and horizontally.
  • 2 double “S” elastic cross-lacing with auto lock: “on the fly” side adjustment!
  • 2 elastic compression cords with auto lock for top and bottom back pocket.
InStinct contents PX 3.1L 2020 US
InStinct Web Focus PX back 2 2020 trail race vest Fast and Light CH 1
InStinct PX Dimensions trail race vest Fast and Light CH
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Shipping & Delivery
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We ship with Swiss Post Economy, which usually arrives in 2 working days.

For larger packages such as skis we use DPD courier services.

Free postage in Switzerland is offered for all purchases over 100 CHF.