CRUX is an alpinist’s paragliding harness designed to deliver ultimate functionality on the mountain. No unpacking, reversing and repacking on steep or slippery launch areas.

An EN certified concept which is integrated into an authentic lightweight mountain backpack solution for the alpinist who loves to climb/hike & fly; this was the core essence of our design goal.

Thinking differently, using specialist lightweight materials and making extensive testing and development in the Tatra Mountains of Slovakia, has made this unique concept of CRUX a reality.

Crucially, CRUX enables simple, direct access & deployment of the harness from the lower section of the backpack whilst keeping all the other gear in place, compartmentalized within the backpack.

Despite being lightweight and of minimalist design, CRUX offers good levels of in-flight comfort utilizing the shoulder and waist straps of the backpack for added comfort. The harness can also be worn whilst climbing & roping up.

The backpack itself is designed to be the authentic climbing partner. Light weight, anatomically shaped, stable and compressible from both top and sides. The 56 litres of volume ensures ample space for all your gear and wing. Included are many specialist features which you would only expect from a top level climbing backpack.

The combined weight of the harness and backpack is only 1250g*.

It is possible to use the harness & backpack independently of each other if desired.

Harness only weight; 360g*.

*Weight of M size without carabiners

Key Features


  • Independent access to harness and gear
  • Lightweight
  • Continuous Dyneema webbing construction
  • Good in-flight comfort level
  • Colour coded fixation points


  • 56 litre volume
  • Lightweight, durable & low profile
  • Elastic mesh side pockets
  • Various utility pockets
  • Roller closing system allowing for volume regulation
  • Compression straps
  • Removable hip belt
  • Internal load fixation
  • External accessory loops

CRUX is available in 3 sizes.

M, L and XL. Please check the sizing table. Choosing the correct size of the harness is crucial to finding the best comfort, CRUX is not adjustable therefore trying on the harness for size is highly recommended before ordering. Please contact your Sky dealer for full advice.

Package includes

  • Grivel lightweight carabiners
  • Additional shoulder straps for use of the harness without rucksack
  • Manual on Sky USB memory stick

R&D team comments

Sky team designer, Cyprian Koren explains the story behind the design.

“I love the mountains. Living in the Tatra Mountains of Slovakia means I have a lot of opportunity to climb and fly, right on my doorstep. But with a busy work schedule, I like things to be both convenient and efficient. I designed CRUX with a really different way of thinking. What if I could combine a comfortable, super light harness with a really functional climbing backpack, without the need to reverse the bag? A backpack that was the real climbing partner, with all the features and that was big enough to take all my gear and regular glider too. A harness that was minimalistic yet comfortable for more than just a quick flight down: Crux was the answer.”

Optional accessories

Technical data

Pilot`s Height (cm) 160-180 175-190 185-200
Suspension Points Height (cm) 45 48 51
Chest Strap Width (cm) 43 45 48
Harness Weight* (kg) 1.25 1.27 1.33
Certification EN / LTF* EN / LTF* EN / LTF*

* Total weight of harness and backpack system without carabiners.

** Pending




  • External: Spectra; Dominico, South Korea
  • Internal: Nylon 70D; Airwill Ind.,China


  • Dyneema 10mm; Mouka, Czech Republic


  • Plume Nut 3NK; Grivel, Italy



  • Main: Nylon 70D; Navitex, South Korea

                     Nylon 70D ripstop; Airwill Industrials, China

  • Under section: Nylon 210D ripstop; Airwill Industrials, China


Zippers & Buckles


  • 15/20mm PAD; Mouka, Czech Republic