Radical 12Z Down Sleeping Bag

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UOG TOP PICK: Engineered for extreme conditions, the Pajak Radical 12Z 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: 

Radical 12Z sleeping bag is a high-quality, ultra-warm sleeping bag designed for extreme cold weather conditions. It is suitable for use on spring/summer Himalaya expeditions and is rated for temperatures as low as -35 degrees Celsius. It is filled with RDS certified 900FP polish white goose down, which provides excellent insulation and warmth. One of the standout features of this sleeping bag is the PAJAK Infrared Reflection Layer (IRL). This layer reflects up to 50% of the infrared radiation generated by your body, helping to retain warmth and improve the overall thermal efficiency of the bag.

Our Verdict

The Pajak Radical 12Z Down Sleeping Bag is a top-tier option for serious cold-weather adventurers, crafted with meticulous attention to detail and a visual design that exudes quality. Packed with 900 FP RDS-certified Polish white goose down, this sleeping bag delivers exceptional warmth, making it ideal for high-altitude expeditions and extreme conditions. At just 1,340 grams for the regular size, it’s impressively light for the warmth it provides, with a pack volume of 6.5 litres, ensuring it’s compact enough for challenging expeditions.

One of the standout features is Pajak’s Infrared Reflection Layer (IRL), which reflects up to 50% of body-generated infrared radiation, helping to retain warmth efficiently without adding bulk. The Z-baffle construction further boosts thermal performance by eliminating cold spots, providing an even distribution of insulation that feels robust and luxurious.

Constructed with GELANOTS Ultra Light Rip Stop shell fabric, the Radical 12Z feels durable, with details like internal and external hang loops, an inside pocket, and a smooth, non-blocking zip that enhances usability. The sleek design and premium materials make this bag reliable and visually striking, a piece of gear that looks as high-quality as it performs.

I’m not one to claim a bag is “the best on the market,” but this would be my top choice for winter wild camping in the UK. Impressively warm, lightweight, and undeniably stylish, the Pajak Radical 12Z is crafted to tackle the harshest conditions while maintaining an uncompromising aesthetic.

– Reviewed by Ultralight Outdoor Gear

Features

• Engineered for spring/summer high altitude expeditions. Combines excellent thermal properties with minimum weight and very good compression. 
• It is suitable for use on spring/summer Himalaya expeditions and is rated for temperatures as low as -35 degrees Celsius. It is filled with RDS certified 900FP polish white goose down, which provides excellent insulation and warmth. 
• It is made in Poland using carefully selected materials and construction techniques, ensuring that it is of the highest quality. Whether you’re tackling challenging mountain conditions or just want a reliable, warm sleeping bag for cold weather camping, the Radical 12Z is an excellent choice. 
• Radical 12Z sleeping bag is a high-quality, ultra-warm sleeping bag designed for extreme cold weather conditions. It is suitable for use on spring/summer Himalaya expeditions and is rated for temperatures as low as -35 degrees Celsius.
• Internal/external hang loops
• Inside pocket
• Non blocking zipper

Specifications

Temperature Rating

• EN13537:2012 Comfort: -7°C
• EN13537:2012 Comfort Limit: -14°C
• EN13537:2012 Comfort Extreme: -35°C

Regular Specs

• Weight: 1340g (excluding bag)
• Fits up to: 180cm
• Inner length: 200cm
• Outer length: 214cm
• Shoulder width: 82cm
• Foot width: 50cm
• Packing volume: 6.5 Litres

Long Specs

• Weight: 1447g (excluding bag)
• Fits up to: 205cm
• Inner length: 214cm
• Outer length: 240cm
• Shoulder width: 82cm
• Foot width: 50cm
• Packing volume: 6.5 Litres

Material & Construction

• Fabric: GELANOTS® Ultra Light Rip Stop Shell
• FILL: 900 FP RDS Polish White Goose Down
• Fill Weight: 880g (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