Born on the trails of the French Alps and race approved around the world.
Redefining a hydration pack comes from asking the right questions... introducing analytical observations & first hand experience in running the toughest conditions. At the heart of each revolutionary Instinct product is the desire to achieve a greater degree of function, accessibility and ergonomics; Total liberty of movement, zero obstruction and a second skin fit.

Delivery / Returns FREE UK Delivery orders over £30,00, Next Day Service + FREE UK Returns
Shipping Information - Details
UK Standard Delivery - This means that your goods will be processed as normal and shipped by Royal Mail 48. Ordered goods will usually arrive within 3 - 5 working days for most of the UK mainland. Baskets with a total value (before vouchers and promotional codes are applied) of £30.00 and over will qualify for FREE UK delivery.
UK FREE Delivery - to all of the UK on almost every product, as long as your total basket value is greater than £30.00 (delivery charges are applied to baskets with a total value of less than £30.00). - All FREE Delivery order will be sent via (UK) STANDARD SHIPPING (Royal Mail 48)
Need it Quicker? - Select DPD Next Working Day or Fast Delivery at checkout - Orders will be processed as normal and shipped by either DPD for Next Working Day service (excluding weekends) or the Royal Mail Tracked 24 service, ordered goods will usually arrive within (1 - 2 working days)
RETURNS & REFUNDS - Details
Return this item for free - If you change your mind on your purchase, you have a 30 days to return it for a refund or replacement subject to terms. All goods must be in new and unused condition and in their original packaging with all labels still attached
PX 3.1L
Visit the Instinct store
€108,95
The lightest, most minimalist, non-compressive & no bounce option for carrying your essentials.
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
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
- Fuel
- Rain jacket
- Safety Kit
- Phone
- Headlamp
- Poles
FRONTAL SOLUTIONS:
- 2 x 500ml hydration pockets + elastic compression cords with auto lock. Sits high for immediate and effortless access.
- 2 x 500ml feed storage pockets: extra large storage & easy access.
- 1 x 100ml shoulder pocket, non-stretch internal cord ring + whistle. For your safety essentials and more
- Front vertical pole attachment (both left and right side).
DORSAL SOLUTIONS:
- 1 x 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!
- 1 x 300ml bottom horizontal pocket with snap button closure gives central access to your safety kit, headlamp(s), gloves, arm warmers
POLE SOLUTION:
- 1 front pole attachment solution. Front: vertically right & left
ADJUSTMENTS & FIT
- 2 x adjustable chest straps mounted on 20cm sliders = custom fit vertically and horizontally.
- 2 x double “S” elastic cross-lacing with auto lock: “on the fly” side adjustment!
- 2 x elastic compression cords with auto lock for top and bottom back pocket.