Rab Syclon XP 40 Backpack

Product detailed description

The Rab Syclon XP 40 is the perfect solution for modern hikers who embrace the "fast & light" style. This backpack offers a unique combination that’s hard to find on the market: it weighs less than 900 grams, is fully waterproof, and features a highly ventilated back system. If you’re a minimalist who counts every gram but needs a ventilated back, the Syclon XP is perfect for you.

Water resistance as standard

With most ultralight backpacks, you have to deal with a rain cover or internal waterproof bags (which we always recommend). The Syclon XP changes that. Thanks to IPX4 certification (splash resistance) and fully taped seams, it keeps your gear dry even in the rain. The main compartment, made of high-strength 40D nylon, is reinforced with extremely durable fabric featuring Spectra® Ripstop technology, which gives the backpack the necessary mechanical durability while maintaining a ridiculously low weight.

Revolutionary AEROFIT™ ventilation

Ventilation is often the biggest weakness of lightweight backpacks. With this model, Rab has introduced a new carrying system, AEROFIT™. It is designed to literally hug your body while allowing air to flow freely to your back. The result is a feeling of perfect harmony with the backpack, which you’ll appreciate especially when moving at a fast pace or on technically demanding terrain, where the backpack stays firmly in place on your back.

Practical features for fast movement

The Syclon XP is built for efficiency. The roll-top closure allows you to smoothly adjust the backpack’s volume as your food supplies dwindle. A great detail is the rear zippered pocket, which can be used either for a hydration bladder or to separate a wet jacket (shell) from the dry items inside. On the shoulder straps, you’ll find pockets for soft flasks and other small items you need to access while walking without having to take the backpack off.

Conclusion

All in all. The Rab Syclon XP 40 is a technological gem that rightfully won the ISPO Award 2025. It is one of the few backpacks weighing under 1 kg that offers effective ventilation and protection against the elements. We also offer the ND 38 version, which, with its dimensions and shorter back length, is ideal for women and smaller builds. For lovers of fast-paced multi-day “hut-to-hut” treks, there aren’t many better options available right now.

Rab Syclon XP 40 Backpack:

• Fully waterproof main compartment with taped seams (IPX4 standard).
• Ventilated AEROFIT™ back system that conforms to the body's shape.
• Roll-top closure for variable volume.
• Zippered rear pocket for a water bladder or wet clothes.
• Pockets on the hip belt.
• Giant front pocket.
• Side pockets for water bottles.
• Shoulder straps with pockets for soft flasks and essentials.
• Loops for quick attachment of trekking poles.
• Bottom and side compression straps (option to attach a sleeping pad).
• Durable material reinforced with Spectra® fibers.

Technical specifications:

• Weight: 865 g.
• Volume: 40 L.
• Dimensions: 63 x 34 x 28 cm.
• Back length: 46–51 cm.

Material:

• Main: 40D high-strength recycled nylon.
• Secondary: 100D recycled nylon with Spectra® Ripstop technology.
• Lining: 210D nylon.