Radical 8Z Down Sleeping Bag

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UOG TOP PICK: Engineered for extreme conditions, the Pajak Radical 8Z Down Sleeping Bag combines cutting-edge warmth, lightweight design, and sleek aesthetics—the ultimate ally for high-altitude and cold-weather adventures and a top pick

Pajak says: 

This sleeping bag is designed for use during spring and summer expeditions in the Himalayas. It is lightweight and can be easily compressed, making it easy to pack and carry. The sleeping bag is equipped with PAJAK’s Infrared Reflection Layer, which helps retain up to 50% of the body’s heat, making it suitable for use in extreme temperatures as low as -29 degrees celsius. The hood and feet areas are protected with waterproof coated inserts to keep moisture out.

Our Verdict

The Pajak Radical 8Z Down Sleeping Bag is an exceptional choice for high-altitude winter adventures, designed to deliver warmth without weighing you down. Filled with premium 900 FP RDS-certified Polish white goose down, it beautifully balances insulation and compressibility, with a total weight of 1,062 grams (regular) and a pack volume of just 6 litres. Ideal for lightweight expeditions, it combines impressive thermal properties with a highly compressible build, making it easy to pack and carry on extended trips.

This bag is also equipped with Pajak’s Infrared Reflection Layer, which reflects up to 50% of body heat to enhance warmth retention—a thoughtful addition that makes a noticeable difference in cooler conditions. Waterproof inserts at the hood and feet provide extra protection from moisture, while a smooth, non-blocking T-bar puller on the main zip allows for snag-free access even in the dark. The Z-baffle construction provides uniform insulation, eliminating cold spots and adding to the overall warmth of the bag.

Constructed with GELANOTS Ultra Light Rip Stop fabric, the Radical 8Z performs well and looks fantastic, exuding quality in its build and finish. This bag feels as good as it looks and will stand up to the rigours of life on the trail.

– Reviewed by Ultralight Outdoor Gear

Features

• Engineered for spring/summer high altitude expeditions. Combines excellent thermal properties with minimum weight and very good compression. 
• The hood and feet areas are protected with waterproof coated inserts to keep moisture out. The main zip has a T-bar style zipper puller, which is easy to locate and prevents snagging. 
• The sleeping bag is filled with RDS-certified 900FP Polish White Goose Down, which provides excellent thermal properties. This is an essential piece of equipment for any Himalayan expedition. 
• This sleeping bag is designed for use during spring and summer expeditions in the Himalayas. It is lightweight and can be easily compressed, making it easy to pack and carry. 
• Internal/external hang loops
• Inside pocket
• Non blocking zipper

Specifications

Temperature Rating

• EN13537:2012 Comfort: -4°C
• EN13537:2012 Comfort Limit: -10°C
• EN13537:2012 Comfort Extreme: -29°C

Regular Specs

• Weight: 1062g (excluding bag)
• Fits up to: 180cm
• Inner length: 200cm
• Outer length: 214cm
• Shoulder width: 82cm
• Foot width: 50cm
• Packing volume: 6 Litres

Long Specs

• Weight: 1166g (excluding bag)
• Fits up to: 205cm
• Inner length: 224cm
• Outer length: 240cm
• Shoulder width: 82cm
• Foot width: 50cm
• Packing volume: 6 Litres

Material & Construction

• Fabric: GELANOTS® Ultra Light Rip Stop Shell
• FILL: 900 FP RDS Polish White Goose Down
• Fill Weight: 630g (Regular)
• Baffle Construction: Z – Very light and warm construction. The baffle between chambers is angled which makes it warmer than popular ‘H’ construction. Best for all season sleeping bags.

Help & advice:

• The Ultimate Guide to Lightweight Sleeping Bags
• Time-Saver Guide to Choosing a Sleeping Bag
• About Pajak
• The EN13537 Standard
• All About Down